uwot, m8? They provide a convenient, free, and conveniently free experience.
are these through official channels and programs? Because that would be the convenient way of playing the games without the whole (usually imperfect) emulator middleman, right?
at any rate, everything points to a ps3 emulator being way too much for either a pc to run or someone to program so... go with ps2 by process of elimination I guess.
I never had much of a ps2 library, so I've no idea what games would be worth your time.