Skip the ram and GPU upgrade; frys has this special if you live near one today only: http://www.frys.com/product/7410075?site=sa:adpages page 10_WED date:012313. They had a similar special about $100 less after rebate the day after black friday. Also check with microcenter if you live near one for motherboard cpu combos, which can have a $50 discount on the motherboard. Your old ocz power supply should work fine except in sli mode. I haven't seen test results for the Corsair H100, but you might do just as well with a large air cooler, such as the hyper 212.