Just to mix it up a bit(personally id go for the 7950 considering I did lol). Im going to have to suggest THIS
. Not really a recommendation as Ive never used Nvidia products, therefore I cannot attest to their performance. Just saying its worth noting, if it was me though Id go for the 7950...in fact a quick search reveals This Gem
which with 10% off and a twenty dollar rebate makes it the same price as the 660 ti. Dont do ram, just do graphics for now id say your set on ram for awhile.