I knew those replies were coming... In all honesty though you can probably make 5 and 10 hp gains with bolt-ons but to get the real power you want a turbo. I think that you will find that most of the active posters on this board are power hungry and will have the same view. If you have that friend with a Cavalier that you are just dying to beat, and will be forever satisfied, then you are a special case.
You have the same block as the turbo models but your internals, in most cases, won't stand up very long to a turbo or nitrous. If you are one of those people that love their car because of some sentimental attachment then you could rebuild (again) with new rods and pistons and slap a turbo on. That or you could even swap in a turbo shortblock. Is it worth it? Only if you really love the car.
On another note, Welcome to DSMCentral
And who the hell would live in Mackinaw!... oh yeah... I do
Since as taxi mentioned, DSMs are not known for their reliability, you will likely see me getting around town in a blue and silver S10 Xtreme or green Saturn Vue. Are you the guy with the 'Drive it like you stole it" windshield banner?