I am putting together a new computer and am kinda on the fence for graphics. After reading the reviews, 2 6800gs cards really smoke. I was looking at getting 2 XFX 6800gs cards at Zipzoomfly for $410. But one 7800gt from xfx is $300. I am working on a budget. Either a more expensive cpu with non-sli board and the 7800 or a sli board and cheaper cpu with the 6800gs sli. Any thoughts?