Looking for power on a budget... Nitrous???

[Chris_32212]

i feel as though i have done almost everything i can in search of more power without spending many thousands of dollars with only minimal power gains for the buck. so far i have done the following. any power adding suggestions would be appreciated!!!

SW headers
Chip from Exotic Muscle
Fidanza light weight flywheel
B&B tri flow with X pipe
Magnaflow high flow metal core cats

i want to do a set of under drive/light weight pulleys, maybe a better chip if there i can find something better or possibly have one done for my car but i need to find out more information about that process. also i have heard that tunning can have a decent reward but i dont want to do that till after i get my car set up the way i want it and i am thinking nitrous is going to be the best way to get the power level i am after. not sure if i should tune the car before nitrous or if i should tune it with nitrous. also, how does elevation affect tunning? if i have it tunned somewhere with a higher altitude like here, Salt Lake City 4,600' about sea level. how would that affect operation at lower elevations? also not sure what power level nitrous to use. im thinking 150hp shot would be sufficient i dont think it would be wise to use more than 200hp shot. is there anyone out there running nitrous? any reccomendations?

Chris