2007 GT/CS Conv.

I'm deployed at the moment and am starting to go shopping for the upgrades I want to do when I get back. For the record, it is a completely stock GT/CS Auto (yes, auto, first stang, kiss off, lol) This car is my project car, I plan on learning as much as I can doing the upgrades myself, and after next deployment get a GT500. So, first things first; What do I upgrade? I don't plan on drag strips or hitting 200, I just want to ALWAYS beat the guy next to me to the next light. I also want to make it sound like a real muscle car. Here's what I've been thinking about. Steeda CAI w/tuner, Cat back exhaust (don't know which to get), hot rod cams (for sound), throttle body, and anything else that I feel I can accomplish. If I get a supercharger it will probably break me. So that's why I've gone with the lesser things first...Any more ideas or input is welcome. Thanks