There have been reviews that better ram will result in better minimum FPS in games.i just made the build before i saw the budget.
the only thing i would change would be to the 660 ti that pp linked. if the budget could take it, go for the i5, but youll want the gpu power over the cpu power. once over a 660 ti, i would go for added cpu power.
re: ram. for a couple of bucks, who cares? you arent going to be able to notice any difference.