I searched and found a few threads about upgrade options from a 8800GT (I have a eVga 8800GT Superclocked), and I was wondering if it would be better for me to get a second 8800GT Superclocked from eBay (even though they are pretty uncommon now), or keep the single GPU and get a 5770. This would be my first time having an ATI card.
I would go for the 5770. Its a nice upgrade, and its dx11, and great performance for a great price, plus it gives you the crossfire option for the future if you have a capable motherboard. At this point, unless you can't afford it, I would always say get something thats DX11. Another advantage is that its extremely power efficient and pretty darn cool, which is always a plus.