For a while there I thought I could make it with just a cell phone. Once our baby arrived, we started considering a land line in case of emergency or as at least a backup to our cell phones in case the battery dies or its left somewhere. We looked at a few of our alternatives and decide to try out the MagicJack USB Voip solution.
Call quality isn't horrible, but its not as clear as a traditional land line or cell phone for that matter. I would say, however, that the MagicJack is slightly more clear than Skype.