I would definately go with the eVGA or leadtek. There was an article over at anandtech.com that had comparisons between them all. The leadtek came up on top, but the eVGA wasnt out yet.
besides the bfg being OC'ed and the evga not being OC'ed, one is a bfg and one is an evga.
no bfg is the newb, they charge you 30-60 more dollars for a mundane 30mhz. if your gunna overclock your gunna void the warranty. so why pay more money for a card that is gunna go the same distance, and if your not gunna overclock that small increase in speed your not going to notice.
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I agree - stay with the warranty. With a very expensive card like the 7800gtx, you'll probably wanna be very careful with your investment