Best GPU for DC nowadays

[CaptainUnlikely]

Been out of the game a while but I'll be back in shortly
Will be crunching/folding with CPUs as well but I like to keep my options open, plus I want to game anyway so I may as well have a card that racks up the points.
It has to be Nvidia because I refuse to deal with AMD's shoddy support. I'll be watercooling it/them. I'm open to multi-card setups, I'm thinking possibly SLI 580s might be the way to go as the 680's compute performance is cut down, though I would probably go for 570s over 580s as they're much more cost effective.

 

[CaptainUnlikely]

In my personal & professional experience, issues with AMD drivers have outnumbered issues with Nvidia drivers at least 20 to 1.

 

[CaptainUnlikely]

I was referring to not being wholly CPU based I understand AMD stomps Nvidia in some projects, I have a 5770 that I used to run Milkyway Collatz (silly me) on and granted have had no driver issues with DC - however this will be my main rig and therefore I need stability in games and general usage too, which to me means Nvidia only.
How does the 6 series perform compared to Fermi? I'd prefer to go higher as I do want to be gaming, but if the 6 series doesn't perform too great for DC then I'll probably be looking to SLI 570s.
I've got no major bias toward any project now, I intend to crunch a variety of different ones so are there a few projects Nvidia performs well on, or is it pretty much just SETI and folding?