Stugray speaks wisely- OFT is hands down the largest bang for your buck. Snatch one up here on the member classifieds for 400-450.
You can run E85 fuel or stick with 91/93 octane and have a car that runs as smooth as she looks. Stock tune is meh
That leaves around 300 or so to spend on other cool things.. people have suggested spacers and camber bolts and an alignment.. If so, buy the spacers from Corner3 garage- they're the best quality and price hands down. $137 for spacers and camber bolts. Add RCE/Eibach pro/swift lowering springs and you're gtg
http://www.corner3garage.com/V3-Spac...WRX_p_482.html
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& for tires..
Enjoy those tires and when they're shot, buy new ones unless you don't like how fun they are/need more grip
