This is my take on it all.

For example, as a starter I have been a gamer for whenever I am using my computer so I have a GTX480 currently which is amazing for gaming, but sucks for mining (sad how it has to be this way LOL), so anyways I was thinking to sell this card, buy a single 6950 which I would unlock into a 6970, which is pretty much on par with a 5870, but with more headroom, and also higher clocks... AND it is still an excellent card for gaming with as well.

I play games like Aion etc which are more demanding on full settings, and it's also known that crossfire setups with the 5xxx series in Aion have issues and dont even work, so getting a 6xxx series card is a great single card option for me, and as I play games (and mine during any afk time), I will make profits to buy even another card. This will net ~750Mhash/s, AND double as a sick gaming rig AND ALSO retain a lot of it's value if I ever needed to sell out.

Demoncrest has spoken =]  lol