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What's your PSU? The GT (and G92 GTS) have some issues with some power supplies. See this thread for more details - notably post #3.
If it works with your system, then I'd also suggest the GT in that price range.
Hmm the antec rep is saying theres also problems with OCZ (and links to someone having issues with a OCZ GameXStream 700w) but I've been running systems using OCZ GameXStream/StealthXStream 500, 600 and 700watt supplies with the 8800GTX and 8800GT for awhile without any problems... so far... (well had problems with the GTX but thats a different story).