Thoughts on any of these?  

Rode a HTW that sat great but was spring horse. I'm not a fan of any flex tree. Local Double J dealer that bought a Seven saddle for granddaughter said it was a "bubblegum machine" saddle. It rolled under horse's belly at a show. She said it was impossible to keep in place. The people I know that have the Masters really like them. 

I'm holding out for a Josey Lught Speed because you NEVER see them used for sale. The market is flooded with all the others. That says a lot to me. 

I just sold my Masters and bought a Seven. It took me a few rides to like riding in the Masters, for the most part it seemed to fit my horse (who is hard to fit) but it rode uphill on her but looked like it sat level. I sold it because the hole I had my left stirrup on stretched out. Enough that it threw me off balance going to the right. They are very popular and it sold in 2 days for $50 less than what I paid.

The Seven saddle I loved the moment I sat in it. It has a very balanced ride and the materials used seem to be better then the Masters. I have only had that one for 2 weeks so time will tell if it holds up. I do not ride daily in it (nor did I the Masters).

I have not tried the Prolite so no help there.