my ottb was bought a week after her last run and funny enough she has been the best horse I've ever owned, you don't ride her off your leg etc.. she is voice controlled trot and she Trot so on so on, her spooky side is to completely put on the breaks and not move. never reared bolted or bucked, because there such sensitive animals I think you grow a bond like no other. I would try sourceofracehorses.com or an online trainer selling stock as they not only sell there race horses but some of them are happy enough to let you take one on loan before you buy that way there is no funny business. My friend got one from the site I mentioned on loan and the owner payed vet bills farrier costs etc she only had to pay for its feed/keep!
I hope you find what your looking for