Most shops that are going to do performance parts for you will be pretty over the top. I would suggest doing some research on here and learn what parts you want, then search for the best deals. Performance isnt cheap. Once you find what you want to do for your car, search classifieds on here and even craigslist, and you can find goodies that other people are looking to get rid of for one reason or another.
Advise for performance parts for cheap for you.
1.Best by far- get a rear sway bar. A used one from a wrx will be had for cheap, for low as 20-40 dollars, and will make an extreme difference in the handling of your car.
2. Header. Perferably bolra or bolra ebay replica(which is supposably better that the bolra)
3. 2.25 inch header back exhaust-
Springs are another good choice to firm up the ride a little bit and possibly lower if you want.