I need to build a decent rig to play current games and browse the web. I only have $1000 to spend and so far I allready have mid tower ATX case, 2 dvd drive/burners, 1 WD 500 gig aaks hdd, PSU corsair HX 520w modular sli ready duel gpu ready psu. So minus the stuff I allready have whats the best I can buy for $1000 to get this complete?