I just pulled the old Amazon trigger on a new phone, the Panasonic 2-Line KX-TG9541B. I've got two phone lines/numbers: my Google Voice line running through a VOIP adaptor (with a Las Vegas prefix), and the land-line provided by my Spectrum internet account (with the local prefix).

Right now I have the VOIP line hooked to a cordless phone, I'll dump that. The Spectrum line is a simple corded black thing, I'll dump that. The new unit will sit proudly on my desk and handle both lines with one common voice message, great speakerphone and tons of other good stuff.