ok, this is my situation. i got a computer for graduation. HP 2.7ghz CELERON *BLEH!!* 512 ram, 80 gb hdd, integrated graphics *BLEH!!*, no agp slot!!!!, cdrw drive, dvd drive. some good things. but i want to throw in a new motherboard and just make this an overall better gaming machine cuz the shit sucks now. what should i do? not too good with computers. what kind of motherboard? need a new processor if i do that? new vid card of course. kind of on a budget. so i don't need an ULTIMATE gaming machine. but i do want something much better. help me out here.