I went with the EVGA 680I , Should have been a great experience, but turned out nothing but trouble (8800GTX and Q6600 quad core go 90watts btw), ended up not posting, so i'll be sending it back to EVGA for (hopefully) a refund or upgrade to 780I for another system.
I've ended up with the Asus P5K Pro, really no nonsense installation, and a super "Throw & Go" board, No more Sata Read/Write fails etc, and great O/C capability with a Thermalright 120 Extreme + fan, Very quiet too.
Does what it say's on the tin, Also shuts down in Standby ok (Nvidia Chipset just froze the machine).
Takes a fraction of the time to boot to XP / Vista too...
I really like my 680i motherboard. Having said that, I DO NOT recommend a 680i board for any kind of a new build now. According to what's been posted abou thte quad core Penryn's, the 680i boards will not support the Yorkies. My recommendation is either a 780i board or an Intel chipset that supports the full line of Penryn CPU's.