I am swapping out my core for a smaller one that doesn't have an onboard 2nd NIC. If you have used a PCI gig NIC that worked right out of the box tell me which one it was.
Thanks,
-Krys
e1000
These seem to work pretty well. I have three of them, one is in my core.
http://www.newegg.com/Product/Product.aspx?Item=N82E16833166002
D-Link DGE-530T PCI Network Adapter. Got it from TigerDirect for $24.99. Works like a charm.