I have an HP Pavillion computer and i decided to upgrade it. I have about 350 dollars so i decided get a bigger case for like 40 dollars (i don't know if i need to tho). I need a cheap AM3+ mobo, a nice CPU and a GPU for like 100 dollars maybe a bit more. I already have Power-supply for 600 Watts and i have a stock cooler from fx 6300 (my other computer). So what i am asking is for a Mother Board, a CPU and a GPU for about 300 dollars. But please tell me, maybe i don't need a case.I was thinking of an HD 7770 but i don't know much. Thamk you.