I just though about something.

If you want 12s, you are not dealing with some slow ricers with a bunch of heavy worthless mods but with some guys tunning compact cars. If you put a turbo on it, your GP won't get the respect you're looking for. They'll say "You had to put a turbo on it to beat us".

I change my vote to adding power adders. You can still go 12s with the S/C. That would be a HUGE slap in the face to everyone that competes with you.

Just because you are going to get a lot more funds doesn't mean you should start spending it or a depreciating car. Save for a house. That way you can beat everyone in your neighborhood with a straight face (just to make them mad) and drive into your driveway where a couple more cars are parked where a hot girl is waiting for you (hey, you got to afford her).

Why beat a couple of folks in a race when you can save and beat them all in the game of life