I have to say asiababy had a very similar approach to me and my wife.
We got married 2.5 years ago and the costs were probably about NT300,000 or so for 200+ guests, and we HONESTLY had the best wedding I’ve ever been to (and I’m not just saying that because it was mine).
We literally organised EVERYTHING ourselves, and gave our parents zero say in the matter (we simply didn’t ask their opinions, just told them how it was going to be - we had a lot if leeway because we could say “This is how foreigners do it”).
Top tips:
- Plan as far ahead in advance as you can, so you aren’t rushing and you will find the best deals. For us this was a solid 6 months.
- Secure the date and venue as first priority, because you have international guests, this gives them as much time as they can to book cheaper flights.
- Your fiancée will need to do a lot of online research for buying various things.
- Don’t use ANY of the traditional wedding industry suppliers. They are all crooks overcharging because they know how much locals are willing to pay. We purposefully avoided all these to make a point that it could be done.
- Wherever possible, seek foreigner suppliers or service providers (ideally friends or friends of friends). You’ll personally have less communication headaches, they’ll probably charge less, and it will simply be a more memorable event for local family and friends who may never experience a foreign wedding abroad (my wife’s family still fondly recall our wedding, where other local banquets style weddings are all identical in format, cold and dull).
- Don’t expect to make your money back from red envelops. This is your special party. Possibly create a western-style wedding list for people to buy you specific household items as gifts, or have an optional non-registered red envelop table (but do have people you trust on it).
OK now for some specifics on how we saved money:
VENUE
We opted for Taipei Country Club on Elephant Mountain, where they hold pool parties every year (we had a pool party wedding). That venue I think is no longer easily available for rent and is also too big for your needs. I would suggest you maybe consider a foreigner run restaurant, ideally one near a good location like Fulong Beach with outdoor seating. Find out their maximum capacity. That kind of limitation helps you control the guest list. Taiwanese weddings are typically open invitation, with no concrete idea of people turning up, as well as lots of people you don’t care about or know. Our 200 person capacity meant that after or direct friends and family, my wife’s parents had about 20 seats they could allocate to their most important friends and family. We have heard of some bitching after the fact from some of their friends who were snubbed, but I don’t care, there simply wasn’t enough room 
FOOD
Don’t go for Chinese banquet style or dishes. I personally only like half the dishes traditionally served, and think they are usually more about presentation than flavour. We went for eat as much as you want buffet style. Of course your options will be limited to the venue’s food style, but go for something fun, solid and western like barbecue, pasta, salad - things people universally like and make it buffet style so people can get their fill. Having people get up themselves for buffet saves you on man-costs for serving, while also increases interaction of people talking in line or while choosing foods.
DRINKS
My father-in-law’s contribution to the wedding was to buy the drinks. There are local suppliers who will sell you trays of beers and allow you to return any that haven’t been drunk. We actually ran out of soft drinks quite early on, which meant people drank more, but this created a great atmosphere as everyone was a lot more relaxed.
ENTERTAINMENT
Find a DJ if you don’t already know one and have dancing (something lacking from most local weddings). If you can’t afford one or know one willing to do it for free, make sure you spend a long time making a long MP3 playlist of party classics, with consideration across decades and genres so that everyone gets a chance to dance. It may be cheesy, but Prince, Queen, Spice Girls, Michael Jackson and other really pop stuff get the party started along with Jump Around, Ice Ice Baby and other songs like that. If you have other musician or singer friends, ask them to perform, which provides variety and keeps people interested. Tell them they don’t need to give you a red envelop for helping you out.
PHOTOS/VIDEOS
You do not need pre-wedding photos! It is a complete scam. So many people spend a solid hundred thousand on that alone. Photos you have taken from real moments in your relationship are so much more touching (or funny). We did invest in professional videographers for our wedding and it was absolutely worth it. It cost NT50,000 I think and that got us 2 guys with DSLRs shooting us preparing, and even they had little cranes, dollys and underwater casing. They then made us a nice little music video which we still show everyone as well as a DVD full of footage. It truly was worth the money. For photographers, we asked several friends who are good at photography to be responsible for that (again in exchange they didn’t need to give us any red envelops). You can also hand out cheap disposable cameras to all the tables or ask everyone at the wedding to take photos with their phones and then email or Facebook them to you.
WEDDING CAKE
Most Asian cakes are crap. Find a foreign baker who will make you a proper western cheese or chocolate cake (or plan to make it yourself). Or simply buy Costco giant cheesecakes or tiramisu or something like that. My chef friend made us both a 3 tier cheesecake and 3 tier chocolate cake. He made them plain, while I ordered some nice cheap cake decorations from Etsy.com, and put my sister I charge of cake decorations on the day.
CLOTHING
Renting is thoroughly not worth it. Buying can be cheaper and less
gross. As with asianbaby, we bought our wedding dress online for around NT1,000 and made some adjustments. For our bridesmaids we bought simple sleek black numbers and tied a red ribbon round their waists. Total cost for those maybe like NT250 per dress. For me and the groomsmen, it was standard charcoal suit trousers and white shirts (while I got a nicer subtle sand shirt from G2000. On top of that we ordered cheap matching polyester ties online for about NT50 each and I found some nice smart waistcoats in Wufenpu market for about NT200 each. So we all looked slick and matching (groom, bride, 5 bridesmaids, 5 groomsmen) for around NT5,000.
DECORATIONS
We found a cheaper flower supplier online, and bought balloons and a few other things from the wholesale area behind Taipei Main Station.
INVITATIONS
We did actually go for a traditional supplier, and found the cheapest to be in a small office opposite SOGO at Zhongxiao Fuxing. We went for the least cheesy letterpress design, so it looked classy.
I think that’s it. Happy to answer any questions (specific contact details for any of the vendors) or ask me if I missed an aspect.
The point is, have time on your side, do your homework, shop around, stay in control of your budget and you can creatively find a way to achieve your goal.
Good luck!
Alex