I know the dual LAN ports on the CL-10000 looks inviting. I personally have lost two network cards on the WAN side during storms last year. They were inexpensive PCI NIC's so the server was only down for ten minutes and I wasn't out much money. If it was a motherboard NIC that got popped, the downtime would have been a lot longer and the repair would be more coslty.
I highly recomend using a PCI NIC for your WAN connection.