I tend to agree, a Lipizzaner X Appendix QH would probably make a nicer cross. I do think the right Foundation QH lines and the right Lip would be nice too, a little shorter and stockier, I haven't seen one but would like to.
As for mine, a friend gave him to me. He was foaled from her buckskin Arabian mare, she had never broke him to ride and had no use for him so he became my fiances trial horse.
Here is my foundation Quarter Horse mare -
And her Appendix Quarter Horse son -