The TD Pro Race 1.2s are great wheels for our cars, I just got some. A lot of folks on here have these. In the stock size, they're about 5 lb. lighter per wheel. If you're new to FiST wheels, the 4 x 108 bolt pattern is a bit rare, so choices are limited. Those were the best choice for me. They come in a range of offsets and with stock hub bores, too, so fitting is easy. The 17" wheels come up to 8" wide, I'm not sure about maximum usable width, I got stock 7" wide wheels to save weight.
The vendor, PCA-1 (Chalon) is also very easy to work with and knows his stuff. Here's the thread on them from the vendor section-
http://www.fiestastforum.com/forum/threads/1248-Pro-Race-Wheels-For-Your-Fiesta-ST-!