Have a look at hardforum theres a long post about the 680i
http://www.hardforum.com/showthread.php?t=1132703
Asus p5k\p5k premium are really good boards. Premium has wifi and an option in the bios to reduce voltage "droop" on the cpu when overclocking. vanilla p5k has the option but it doesn't do anything, so for overclocking the premium is much better.
Btw how many pins is the main atx connector on your psu? Theyre all 24 pin nowadays.