Mercedes' questions and analysis of the buying decision process are excellent.
Based on a very casual review of the photos of the horses listed; the black and white mare is the most attractive and the most athletically conformed.
Cinderella is jumping well in the one free jump photo, but *badly* under a rider. May be a problem that proper training could correct, but her jumping photos would scare me off.
Jack Sparrow's jumping photos are more encouraging, but he's got an underdeveloped neck and a high head set.
The unnamed mare is the pick of the litter as far as I can tell. Better mover, better jumper.