I would pass on both horses you just posted. The first mare has very choppy trot and sub-par movement, and the second horse's conformation doesn't impress me. I wasn't able to watch the video of the second, but of these two, she's my favorite.
That being said, I think if you keep searching you can find a lovely OTTB with good conformation, sans soundness issues. They're a dime a dozen right now--you just have to know where to look.