In order with the basic bolt ons, I would say:
- Diablosport Predator (It tunes your car, do a search feature, a LOT of info on these forums about it)
- CAI (Cold Air Intake, runs roughly $250)
- Catback Exhaust (Check sound clips to find the tone you want, don't be afraid to ask questions, or opinions)
- High flow cats
- Underdrive pulley
- Headers (Shorties or Longtubes, depends what you want, and how bad your states emissions are)
Now after that it depends what you want, but a set of heads, and a cam will add quite a bit of power to the wheels for you. The best bet is do some research, read some threads but overall maybe find a goal for now money wise and go from there to get a nice package, if you can afford it you can cut some labor on some of the more in depth mods by doing more mods at once, if you aren't doing them yourself. Ie: heads, cam, headers, underdrive pulley, etc..