Decided to upgrade my second land line to VOIP. Kept 1 line in copper because it always works even if the power goes out. Although the services are very similar, the set up and costs are not. Comcast costs $40 / month, Vonage costs $25 / month and surprise, Qwest costs $20 / month. While Comcast and Vonage require you to plug in their box into the cable modem, Qwest uses a Linksys box. You can optionally plug it into a router if you want to use the phone somewhere remote from the cable modem.
Qwest doesn't advertise their "broadband phone" but I found it here. If you call, say hi to Henry.