I will drop over $100k on wild TWH without a second thought lol it's become a problem. 

The only ones I've found to sell well are Saddlebreds, Thoroughbreds, and Chincos - unless the horse has a rare marking of some kind, those seem to go quickly regardless of breed. 

I will, sometimes, entertain idea of white Thoroughbreds to inject that into my lines, regardless if they are flat racers or not. My cousin, Maki, and I, are always on lookout for Mama/mama genes in Thoroughbreds, flat racers are preferred but not necessary.

Chincos for me is next best as I am trying to work on the breed to make them better and breed them only when they reach level 50. Trying to get a decent stock going so I don't have to run into inbreeding if I can from my own lines. Though due to Chincos, I've been struggling to make bits back from buying some 😂. I do have some rare items that I could be willing to part with but for right now, I am simply working on my current stock first and will look into more down the line when I am in a better place with my stock.