I have an Intel P/// 650E OC'ed @911Mhz for a year up to now and I must say I'm happy with it as I can run any game I want between 1280 and 1600 res. very smoothly !
OK, I admit I'd like a faster cpu (a real P/// 900Mhz, OC'ed afterwards, or a 1Ghz also to be OC'ed...), but I own a very good Slot1 mobo (for a little more than 1 year also, before I installed the 650@911 thing) and want to keep it as long as possible (because of money of course) !