I'm staying away from recommending any of the 680i boards because for one, in my opinion, they are truly untested still, and will most likely get demolished by the R600 coming out later from ATI.
My favorite on this list would have to be the Bad Axe followed closely by the DQ6 from Gigabyte and the Abit max These three are from trusted and tested overclocking chipsets, which I imagine you'll be doing with DDR2 1066, and are proven OCers.
I am currently running the P5B Deluxe wifi with an e6600, 2gigs, and an 8800 GTX, along with what you have listed.
Stable as a rock with the latest bios, easy OC, and I mean easy. The board comes with a utility that runs in windows, and you set your OC from there, no bios adjustments. Automatic recover from a bad OC either thru bios or the windows utility.
Nvidia OC is odd on this though, cannot push the OC on the vid card as hard as I could on the ATI.
My x1900xtx would go as high as anyones, run steady forever. My 7900 GTO and my 8800 GTX both will only stay stable with VERY moderate OCs and even then do not remain so after several on/off cycles, I have to go back to stock and creep up again.
Most likely a driver issue with the forceware stuff.
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