I think I'd have to go with the third vintage set I ever bought, my 1959 Zenith.
I catch my self staring at it all the time despite it rarely being used. I just love the styling of the set. It also has a swivel base.
My runners up for the monochrome catagory are also Zenith (they must of had good cabinet designers then).
There is also something about the next two sets and UHF converter when they are stacked in the manner I have them stacked that makes them as a whole look better than individually.
As for color sets that is sort of a toss up, and I'll have to think hard on that one.