f*** the shift kit, do the J-Mod on the 4r70W. thats what im getting done come summer if i still have the land barge. its better than a shift kit(for autos) and it will make your tranny last longer than it could stock. also while youre there for another 300 get a 3000rpm stall torque converter and you will feel more of a difference with just the tranny mods than a CAI and Pullies. pm me and ill get some info for you for the jmod.
if its a manual were talking about, id say ebay CAI, short throw shifter, and save up for some pullies.
BTW the price on a jmod if you do it yourself will only be like 50$ for the parts if you get them through ford, anywhere else will be like 30$. itll be more if you have a tranny shop do it though. check on TCCOA.COM and go to forums then do a search on the jmod and youll find all the info you need.