VTech's system might be a good solution for you. But if you rely on your cellphone's address book to identify callers and aren't up for inputting these data again, it might be worth waiting for a Bluetooth cordless phone system that will automatically copy data from your cellphone...
The line became fuzzy when I moved too far away from a phone's base station, though VTech says a connection can stay clear for up to about 900 feet. I almost forgot that cordless phones can't be taken out of the house. While on a phone call, I had to stop myself from heading ...