I'm not sure how tall he is, I'll go measure him tomorrow. I would say that he would need an intermediate to advanced rider just because sometimes he will jump at things or refuse to walk towards something he considers scary. He is farely well mannered in winter and in summer he is really good. He is definitely an agressive horse when it comes to other horses but with people he tries his best to please. Now in winter because I don't ride him much when I first get on him he is sometimes really spooky but in summer when I would ride him more he wasn't that spooky. He is sound and has no health problems. As for the market it all depends on the person. At a local auction I would be lucky to get $1000 and I don't really know what privately would be like.
Here is the video of him in his fence. I have 2 other videos of me lunging him that I will put on here later.