the 4g63t was designed to handle boost. i don't think the 4g64 was.
4g63t = loads of aftermarket support thus can reach higher numbers
4g64 = more displacement and more torgue however its hp expanability is limited by a semi lack of aftermarket support.
if i were you i would do the 4g63t swap and the tranny swap. im sure you can pick up a wrecked talon or something and take out the engine and tranny. just hunt around and you can get good prices. you will need to go an ecu for the 4g63t too and im pretty sure you will need a wiring harness.
and how much money are you looking to invest here?
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