http://www.cobbtuning.com/main.html
Shawn, here is a compnay that I really like and have purchased a couple of things from. They have staged power packages. You can get pretty good power from a WRX and still maintain the driveability.
While the STI's kick a$$, I just couldn't see myself driving it the long distance everyday that I use my car for. I have been completely satisfied with my non STI WRX.
Bill