Originally posted by beyondloadedSE:
paint everything you can possibly imagine yellow! 
Stickers!!! Can't forget them...

Seriously though...
Nitrous is the cheapest way. Once installed ($500-2000) all you pay for is refilling it (well maybe it's not that cheap)
Okay skip Nitrous I hate it anyway...
Turbo or S/C - Both over 3k... (not installed)
Always on power. Turbo would be my choice. Either wait for Chris or build your own kit...