eVGA. I just sent in FOUR (yes, that's right, FOUR) defective BFG cards. One of my two 6800 GT OC's in SLI went out and they sent me a replacement card (a 6800GTX, which was not only the wrong card so I couldn't use SLI, but was defective as well), then a 6800GT, which was DOA... and then another 6800GT which froze after 5min of CS Source, and my LAST 6800GT which had the same problem as the previous one... and I know for a fact the cards were defective because my other, working 6800GT didn't have any of the problems the replacement cards did. After all that, they finally sent me a 7900GT OC to compensate for the time I've gone without a working card (this all took the better part of 4 months to resolve) and I'm selling that card to a friend because I'm DONE with all the hassles BFG gave me.
What good is 24/7 phone support and a lifetime warranty if they can't even send you a working replacement card?
BTW: Just purchased two EVGA 7900 GTO's and am running them now, with no problems. So there.