I have seen xplaneuser's videos (our aussie linux friend) made using his GTX680 and started drooling since last week. =)
Hence - I have picked one up for the 'pro; un-boxing and hookup will be friday night; and will attempt to make mincemeat out of our XP10 photo-scenery. FWIW, GTX670s are now selling under $399 in Australia. To any Sydneysiders on the list - head to Ti Computers in Crows Nest. - CK.