Picked up an HP360T dual port Intel based NIC on the cheap. This will give me a few extra ports to work with when it comes down to adding the file server. Installation was simple, just pop it in and it's recognized as an Intel 82571EB ethernet controller with two vmnics available. The server has a total of four ports now, three being Intel based, and one Realtek based. I'll probably end up using one port for a direct connection to the file server, the another for management, another for internal virtual machines, and another for web-facing virtual machines.