Color to me can be made pretty by a dogs good conformation, or the same color can be ruined by a dogs bad conformation. When i was young and single i could care less what color a girls hair was if she had a pretty face and good conformation.
Seen beautiful hounds in all those catagories. I like the Tri-color the best, no particular reason just do. I have three of the colors you mentioned, so I wouldnt turn one away just based on color, but my simple answer to the question is a nice Tri-color (blk/wht/tan).