IMHO, get a WRX instead. I've had both. The difference is minimal. The WRX have the 6 spd now, and they're just as fast in a straight line as the STI. The ride is nicer, and in the winter, when the roads are heaved, you'll appreciate it. The WRX is also way better on gas than the STI. Get a mild/safe tune on the WRX, to wake it up. Then, spend some of the savings on nice, wide rims and better rubber.

I've driven both back to back. There's nothing on an STI that's worth the extra money. Yes, the brakes are bigger, but they're terrible. If you try lapping in an STI, the first thing you'll need to do is replace the pads and rotors anyway, because they suck. They will overheat, guaranteed. The STI is only ~150 lbs heavier, but it feels much heavier.

Obviously, the decision is up to you. But, drive both. If you can't get a test drive from a dealer, let me know. Someone from the Subaru club will let you go for a quick spin, for sure.

GL.