quads aren't really being used by most games right now so it would be wiser to get a core 2 duo since you're on a budget and you want to get the best performance for your money
well i was getting the 650 becuase it had duel videocard slots and thats what i want lol so im probley going to stick with 650 unless theres a 90$ mobo with duel video card slot
dual slot video cards don't need 2 pci express slots... they'll take up one, and just cover up the other one.. and he had a 24'' Widescreen monitor where it would be useful