sounds like you've got about the same goals i've got. there'* a chassis dyno about an hour away, and hopefully within the next two weeks i'll be able to get down there, and i can let ya know what the stage 3 kit will put down.
i think heads aren't a waste of money unless you upgrade to the gen v m90, and even then you might want an i/c. if you wanted to stick with the stock m90, www.wbodystore.com
has an awesome lookin' intercooler with a 3" (!!!!) core. supposedly they ran a 2.6" pulley with everything else bone stock, no KR. with intake, exhaust, pcm, rockers, that i/c, and even "just" a 2.8" pulley, that should be pretty darn close. that'* what i'm plannin on anyways. just my two cents.