Just wondering myself what works best for ultra settings 3s comp on a 5760x1080 desktop. 3x video cards with each screen dedicated vram or a single beast of a card?

My 460 GTX seems to handle towns and raids (little less) for a single instance with 1GB of vram. I think it does suffer some on raids though at ultra settings. Was thinking that I'm not doing anything but 3s anymore so maybe just three cheap cards as opposed to one expensive card? I love running on ultra settings so that is what is key here.