My problem is I cannot fit a 8800gt 512 into my $550 build budget, if I stick with the e6750. I could down grade to e6550 and upgrade from a 256 gt to a 512 gt. Does it make sense to lose a few mhz for a killer gpu? I'm a casual gamer and will not be hitting high res. I do believe that 512 will be a requirement within a year even at lower res.