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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;
Then I would suggest that you get a device that is capable of delivering the higher of speeds that you mentioned.
See if it tells you your corresponding speeds here (scroll down a bit on the right side);
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;