Sorry BustangGT - I forgot to say WELCOME!
Most folks agree that starting out the most bang for the buck is gears. Especially for us auto guys. I haven't jumped yet but if/when I do I will get 4.10 Gears and some suspension mods, Lowering springs. All I have so far is a K&N Drop In filter. Most also agree that a CAI, though pretty does zilch for a lightly modded ride.
Edit: Yea what Uberstang1 said!