O/k so you don't need an 862 if you don't have phone service. "Extreme" speeds can be 150 to 300 depending on the local area. Extreme Pro is 400. Which speed do you pay for ?
Look here for an idea about retail available devices;
I would get a separate modem and router. The Arris SB6183 is a tried and true performer !
Here is an excellent site for researching routers;