You don't need another router, IIRC. You just need to know the name and key of your router for the set-up.
FYI, for a basic home network, the 2WIRE equipment is OK. If you want something better, most of the higher end models from any of the big three will do. I use a Netgear N900, and I currently have 24 connected devices on it and it doesn't miss a beat.
Hope this helps.