I would go with either one of the 300mbps modem onlys. If you are happy with your current wireless router then I would stick with that. Not knowing what you have currently as your setup, I would suggest you ask them to put the modem in "bridge mode" (not sure if TWC allows that, Shaw in Canada does). Bridge mode would make the modem transparent and allow you to run your wireless router as the device controlling all the network traffic.
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"In theory, there is no difference between theory and practice. But in practice, there is" — Jan Van De Snepscheu
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