The standard RAZR has what you want. You can change the mode where multiple contacts, with the same name, are rendered on one line of the contact list. Left/right arrows let you select the different dialing icon. Kludgy, but it works.

The new Moto KRZR is exactly what I want, from a hardware perspective, but the software is clearly just a derivative of the existing RAZR software, which pretty much sucks. As such, I'm going to stick it out for six months to try holding an iPhone in my hand and see how it feels.