I'm not a fan of the 3rd one - especially his neck. The 1st one is my favorite and the 2nd one looks like he would make a decent trail mount.
But $1000? Yikes! You might want to check into the TIP program. You get a gentled mustang for the normal adoption fee of $125. Awesome program - that is how I got my mustang. Even if there are not adoptions in your area there might be a TIP trainer.