i find it funny that people just talk out of there ass on this site.
any rb swap is alot of work, and unless your very good at wiring, welding, and measuring then you're going to pay out of your ass for a shop to do the work.

people always say "rb's can make all kinds of power on stock internals"...
while thats true, i bet 90% of you guys that are saying to do the RB swap would blow that motor up within months, at low HP levels.
tuning is everything, even more so when your putting engines in different cars that what they came with.

LS1 would be the best swap, why? more power, easier to find, parts are cheaper, lighter, stronger, and in the long run would be a cheaper swap.

then i would go 2JZ or 1JZ.

then Built KA-T...

then maybe RB.

SR20's... blah not a fan of them.
ive built many and been around them alot but they never do anything for me.