I would pass up the first mare. She's pretty, a little more downhill than I like, but her pasterns look WAY too straight, and her front knees look very... off to me... Does anyone else notice this, or is it just me?
The second one is downhill and seems to me to have long pasterns, but overall, I do like him more than the mare.
The third would be my favorite conformationally, although (it might be the wraps) His front legs look a little over at the knee. I'm not sure, I'm no expert with conformation, lol.