hi guys i'm new here,i'm searching for info.i got a presario sr 5113wm desktop.i upgraded to 4 gb of memory.i watch a lot of tv and play some games on this computer and i have it hooked up to my 42 inch plasma.the video card is a nvidia 6250se i believe,can anyone tell me what the best video card i can purchase for this computer would be,without changing power supplies and everything else.thanks in advance to anyone who can help