680i boards have gone through many many revisions to get to their relative stability now...
I've had my ear to the ground for a while on this and the 780i boards seem to be a bit buggy right now...though I'm sure they'll get it right eventually
My BFG board has been nothing but great (check sig), however the 780i boards are rumored to have support for the new line of intel cpus and have a 3 full 16x pcie slots.....680i has 2 16x and one 8x (doesn't matter to me...the only triple sli cards available are I believe the Ultras and the GTXs
my guess is it will take 6 months before the 780i boards get the kinks worked out (note to nVidia...we are not your lab animals)
any specific questions about 680i you have?