All I know is if I were anything but completely desititute, my engine choices in an MR2 would look something like this (and I would advise most people with reasonable financial means to look at them in this order):
(1) Gen III -- the ultimate 3SGTE for the MR2 (A fully up-to-date engine capable of hanging with the Evos and STis of the world with very minor tweaks. Unless you're poor, look no further).
(2) V6 SC - Brad Bedell showed the world what this could do. Great power with a nice, fresh and plentiful power plant.
(3) V6 NA - As simple and reliable to run as the 5SFE, only with some real grunt.
(4) Gen II - Kind of an also-ran in the higher HP MR2 engines. State-of-the-art in its day. Know and trust your engine builder, because this will likely have been torn apart and put back together at some point in its life or will soon need it.
-- DavidV
