im using a BFG 6800 GT from BFG. BFG is good stuff CHumbo.com to buy from them and if im not mistaken the BFG comes OC out of the box. I know the GT does not srue about the ultra though.
True, the stock OC of the BFG doesn't mean a thing, but mine has OC'd very well, I can easily run it at 425 core, and has seemed to be on par with the other quality makers such as eVGA and Leadtek 6800GT's. BFG is still definately a top name for nVidia cards.
BFG makes too much of a big deal about their tiny OC.......you can take that eVGA toss it up the 20MHz extra BFG has it as soon as you get the card dude.
eVGA all the way although I see you've already said that