I have successfully setup a network using the RT31P2 router/phone adapter, and the USB200M network adapter. Tivo connects fine to the network, and the Vonage phone service works perfectly fine. Also, it was VERY easy to do. All plug and play... no driver installation needed for the network adapter or router and no configuration needed for anything. The router configured properly automatically, and TiVo automatically configured itself for the network. Hope this helps those who are thinking about doing the same thing.
Now to setup TivoWeb...