3SGTE swap questions

[blindside21]

OK so I did some research on my 92 n/a mr2 n realised a 3sgte swap seems to be the smarter way to go so heres some questions...while the engine is down I'd like to put in a new tranny (maybe a six speed) im not sure what the mr2 aftermarket scene has to offer but also while the tranny is out would i need such things as a competition clutch/flywheel, diff? Im back home for the summer (4 months) and this is gonna be my project car, any help on the situation would be greatly appreciated. My aim is a 300-350bhp car pushin around 12 psi without any problems and 20 psi for fun (tell me if im dreamin here)