I am working on a build and I have to select my GPU. I am running two 24" 1080 monitors, which is pretty awkward for eyefinity, so I will generally only be using one display. I have been reading reviews and am now torn between saving money and having a setup that will support the next two years of games. I was wondering if for my resolution, a single HD6870 will be sufficient for playing games like Crysis 2 on the highest settings, or should I crossfire two of them? Or would it be a better option for me to purchase a single HD6950 or 6970 now and then crossfire later when games require them? I am trying to make best system without any power going to waste, so what should I do?