As Ranlee said I recently bought a bike–Taokas Striker SL–from Jesler Bikes Taipei branch (near Shuanglian station on the red line). It was last year’s model but they may still have a few, I can LINE them for you if you want.
The bike is 58cm and that’s essentially the biggest you can easily buy in Taiwan, from what I could gather during my shopping. I’m 6’3’’ / 192cm and I have ridden 62cm, 60cm, and 58cm bikes in the past. 58cm so far is my favorite, but it’s really up to your body size & proportions & personal preference. 58cm is “small” for someone my size but I like to ride a smaller frame.
The strange thing about buying in Taiwan (if you’re used to buying in North America) is that you can’t test ride. Like Ranlee said, I bought my bike special order sight unseen. I was a little nervous about that, but it worked out great. The guys at Jesler are very very helpful.
The Taokas Striker SL I bought is carbon frame with Shimano 105, it’s last year’s model so I was able to negotiate the NT$48k list price down substantially. And they fit me and gave me a good deal on a bunch of accessories. Taokas is a local brand and though I’ve only put a few hundred KMs on it, so far the bike is treating me well.
Good luck in your search.