"What are some (aesthetic) "deal breakers" on an otherwise breeding quality horse for some of the other posters? Or even pedigree problems that would cause you to not breed a phenotypically superior horse? Are there any?"
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Sorry, the phone rang and I hit send before I actually got done. To go along with what I said above.
As far as a deal breaker on a phenotypically superior horse for me is lack of performers with sire and dam. If a horse looks absolutelly stunning, but is weak in pedigree, I wont use him. If he himself wont catalog well, I'm out and it better not take 3 or 4 dams on his page to get to anything. Thats just my personal criteria.