OP, I liked your first three picks. Great conformation on those ones IMO. The others you picked, eh not so much.
Mustangs make fantastic little horses. From my experience with my own, they can be stubborn ("I KNOW I'm right and YOU are wrong!"), but once you have their trust, they would do ANYTHING for you. I adore them, great horses, and super healthy/low maintenance too.
Someday, we will be able to afford a second horse. As much as I would like to get an OTTB, I think the best thing would be to get a BLM mustang for DH and help him train it. There is nothing like starting and training your own horse. The bond is so much deeper and you learn so much.
This is my captive bred mustang. Out of a BLM mare from private owner, sire unknown but I highly suspect that the sire was a Tennessee Walking Horse.
"You can do something wrong for thirty years and call yourself experienced, you can do something right for a week and experience more than someone who spent thirty years doing the wrong thing." ~WhattaTroublemaker