This is why I only use boards with intel chipsets. Stability is the most important thing when picking out a motherboard. It's a more important consideration than performance IMO.

I used various nForce and nForce 2 mobos back in the day with my Athlon XP and never found one that was stable. Since then I don't touch nVidia motherboards. They should stick to making video cards. The fact that AMD doesn't make their own chipsets is why I no longer buy their processors.

Intel Processor + Intel chipset = stability. Otherwise you're just asking for trouble. Send that 680i crap back and get a 975X board.

I'd be worried about ip address conflicts. Typically you would use a switch instead. A switch isn't expensive.

If you want the best PSU money can buy get a PC Power and Cooling PSU, probably either the Silencer 610 or 750.

It's pretty hard to go wrong with either NewEgg.com or ZipZoomFly.com

I have the Zalman 9500, which is similar.

Sandwich the CPU area of the motherboard between the plastic backplate (which you put on the back of the motherboard) and the plastic front plate (put it on the front of the motherboard) using the four screw holes around the processor. Use four screws to screw the backplate and frontplate together. Apply your thermal paste to the processor and possibly the heatsink (follow the instructions included with the paste). Lower the heatsink down onto the processor. Make sure the fan is facing the back of the case/motherboard.

Take that metal bar thing with the hole in the middle and two screw holes (one on each end). Put the center hole on the metal bar over that screw-looking thing in the middle of the heatsink.  Screw the two ends of the metal bar thing into the holes on the plastic front plate. It needs to be tight so it won't fall off, but don't go nuts tightening it either.

9/10. Good to go for quite awhile I would say.