Jet
VIP Member
The 680i SLi board has onboard Gigabit Ethernet which will be fine. It's built in and will be fast. 100 times what your internet connection is capable of.
I still don't see why you're spending so much $ on your PSU. My friend has a 550Watt PSU running his 8800GTX.
While 550w is a little low (in my opinion), I agree with Grey. Scale back a little, and consider something in the $150-$225 range instead.