See this post for current available speeds and the prices if you go with Hinet (other ISPs will vary in price for the ISP portion of the charge):
[forumosa.com/taiwan/viewtopic.ph … 014#201014](Chunghwa rolling out 8M ADSL starting June 1
As with Big Fluffy Matthew, you may not be able to get quite the full speed depending on distance from the switch, line condition, and your hardware and software configuration.