well That goes for any car. ^^^
Power
y-pipe, maintence, MAF, Stage 1 clutch/ 8lb FW, then the expensive stuff comes, EH intake, udp, cams, exhaust, headers, BBB's.
IMO suspenion mods would be the best bang for your buck. The difference you feel will be ALOT more than any bolt on mod. It will make your 220hp feel alot fatser and you will have a huge grin on your face around every corner.
No real order here.
1.springs/shocks (ebiach, intrax,/ w koni's or now thanks to SHOsource u can get real coilovers) 500-1200
2.ALsfb or delrin SFB-100 or less
3. Subframe connectors-60 or less
4. New OEM or TPR bushing.-propably needed anyways
5. sway bar combo u like. 24mm/26mm Front Rear is a great street combo.
6.strut bars. cheap 50-100 each
7. Wheels- Lighter the better but looks IMO are more important.
8. Tires- Wider the better and buy the best u can afford. They keep you on the road!!!