I'm building a new gaming pc and i need a graphics card.I was going to get crossfire amd 7970's that will give overall higher than a gtx 690,but was told it would cause problems.I want to play games like crysis 2,Metro LL,Tomb Raider,Bioshock,and of course play online.I want a strong fast GPU that is better than a 660,and below 1000 usd.Any help would be appreciated!