Of the ones that PP posted, I *greatly* prefer the first two, Oliver and Bad Boy, assuming that Bad Boy's left front isn't as wonky as it appears in that photo and they just couldn't get him to stand evenly.
I love Oliver's substance and bone and overall impression of balance. From a hunter ring bias, his neck ties in a little high on the shoulder, but that confo is actually an asset to a dressage horse - he's a good all around sport horse prospect.
A horse that is racing sound at 6 is a tough, hardy individual.
If you want younger, then Bad Boy, (assuming the wonky leg is a photo issue) is also a good prospect.