[ultraflo]

From your list of mods, I agree that the cat back kit would be a good choice. You should enjoy the enhanced exhaust note too...

Also, the pulleys are a good choice. Just make sure you get the billet alum. power and amp pulley setup. A smaller than stock dia. pulley is available from March performance, this will keep your amps up and your battery charged with that stereo system. You won't have to worry about your power steering performance with an aftermarket underdrive pulley kit. (get billet alum, super lightweight stuff, and less reciprocating mass)

I read a magazine article some time ago where they were testing basic mods on a dyno... Removing the screen is NOT recommended, it smooths out the airflow for a more accurate reading of incoming air or some BS and resulted in a net loss of 2hp if I recall correctly.

The bigger MAF, T.B., intake, injectors, (mild cam, stock ported heads or aftermarket), should be done as a package in my opinion; that is, its easier to do all at once... (and you don't have to send in the MAF you bought for stock injectors back to be recalibrated for your bigger injectors)

Hope I could help some...
I just thought of an electric fan setup, that frees up some hp (up to 10hp I believe) and you can control the temp of you car much easier in the hot air. And you get rid of that nasty clutch fan!!!

March billet pulleys and a Black Magic electric fan???
Or a cat-back system of your choice...