for your system Specs, you should Use PJ64 and its default plugins (V1.5 SP1), as you should have no prolems with any game. 1964 is best if you have a slower processor and some high sys requirements are needed for some games. Your 1.7 GHz should do fine, except for Conker's BFD and DK64, you might have some trouble with, but shouldnt be a big deal.