No offense, but I would NOT rely on an onboard NIC. That gaming NIC is overkill. You don't get much of a boost for a ton of money, as alcattle said. You can get a nice DLINK gigabit card for $30.

As for the video card, if wow is all you want to do with the system it will work fine. You can run 5 with good fps. You could run 10 with decent fps.

I know I recommend it in every thread I post in, but consider a second HDD just for wow. Even a 74GB (if you can find one) 10k RPM Raptor would be big enough. I used a couple of 80 GB drives in a RAID0 and that worked great. Just keep in mind that with RAID0 you get no redundancy :/ You can get a 160GB 16MB cache drive for around $60, last I checked.