I currently Have 1 896MB EVGA gtx260 OC edition and can get another on EBay for around 50$. I play games such as WoW, Black ops, Diablo 3, Assassins creed series and some driving games. Would i benefit more for the money by just getting a second card or spending more than twice as much on a higher end newer card? My system and CPU are newer, AMD Phenom Black 6 core and 12 GB ram. Asus MB. Thanks.