I like the stallion better than the previous posters; in the website photos he has huntery/dressagy movement. I will agree that he's lighter bodied, particularly in the hq than most quarter horses. In fact, the only thing that really looks QH-y about him is that thick throatlatch. Looks more like an appendix QH. Thinking this through as I type; I like him as an individual, not as breeding stock. I think they kept him intact primarily for his color, which is spectacular, but not enough reason to keep him a stud.
However, I think we're approaching this from the wrong end - why do you want to breed your mare? And what are her qualities or performance record that makes her a good broodmare prospect?
If the real answers to those questions are you want to raise a foal and what makes her a broodmare prospect is she's the mare you have, please don't breed her.
You can buy a good quality weanling or yearling for less than you'd put into getting a foal on the ground out of your mare. And you'd be dealing with a known quality.