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You most assuredly are able to use two separate modems in your home: one specifically provisioned for your CDV service, and the other for your internet service. I would suggest contacting customer service again, and asking them to schedule you for a service call to have a second modem installed and provisioned for the internet service. There may very well be a service charge, but $125 sounds just a little too high. Be sure and ask the agent to quote you an accurate charge for the service call before making your decision. Please feel free to contact me if you have any problems.
Well, actually yes, but I did misspeak when I said that the modem needed to be installed. The process actually involves de-provisioning the eMTA (internet service only), and then re-provisioning the subscribers modem with the internet service. Unfortunately, it generally does require a technician at the home to complete the process.