normal gaming ?? Hi guys , i dont know much about graphic cards , i use AMD Quad core Phenom 9550 , Gigabyte S series GA-MA78GM-S2H mother board and 2gb ram ,OS windows Vista Ultimate Edition, i am looking for a budget graphics card , i got to choose between nvidia 8600 512mb ddr2 ( or 1gb) or ATI Radeon HD 2600 these are the models available at my place , kindly guide me before i buy, than a lot for ur replys.