FSP is the OEM of Tacen PSUs and they have good reviews. But they are very cheap...probably they are manufacturing it in Asian countries to reduce the price. I had a hands on experience with the 600W module and from the outer look it is no where near Corsair or other premium brands. But they are running a HD 6850 along with a Phenom II 720 and 6 Gigs of ram without any issues. Another thing is they are having modular design, very rare in this price point.
It is very hard to find reviews about them as they are not active in Europe and US but I found some reviews in other languages and read them...thanks to Google Translate. Reviews are generally good. One thing, those PSUs are not as silent as Corsair or Seasonic.
My suggestion is grab the 600W module, price is only 3.2-3.5K. It is 85+, having quad 12V rail with 18A on each. Here is a Review.. Don't get the 500W, probably it is discontinued and details are not present in their site.