you'll be in the 13's once you put those headers on.
I say go with a set of drag radials.
only because nitrous is pretty cheap, but super fun and makes you pretty damn fast, GET NITROUS.
I am leaning towards IPF myself.
as for road racing, and getting your car up to par, I would go as you are. Test out how you like it, before spending big money on it. If it's only a once in a while thing, I wouldn't spend too much money on parts. I guess what i'm saying is, if you aren't trying to be competitive, I don't see the need to over spend.