get a 1600+, it's just a lil' more than a 1500+ plus w/o unlockin' it you can get a bit more performance. but if you do unlock it and unleash the beast, make sure you get a good mobo that will let you adjust the multipliers very high. i think my Soyo Dragon will let me adjust it all the way to 14. and it'll let me adjust the FSB too. so get a good processor, unlock it, and get a good board, with some "supercooling" you might be able to get a 1600+ running at 1.75-1.8 Ghz. i know i can run stable at 1.66.