Here's what I think: I would go with Boomer or Star.
Reasons: Indy---seems too timid for the ring.
Libby---ears not as long as Star's, not as pronounced dewlaps.
Missy----while very cute, her ears are again, not as long as Star's and her dewlaps are the least pronounced of the litter.
Star----wonderful long ears, nicely defined dewlaps, and calm expression.
Boomer-------great color (although it has no bearing in the ring as far as breed standard), nicely pronounced dewlaps, ears not as long as I would like but he seems
to have a calm demeanor and extrememly intelligent expression.
If I were picking one for just a pet, I would probably pick Indy-----I am partial to tri-colors and prefer males to females.