Well, right now I have an American Warmblood, but I'm in the process of selling her, and I'm not sure what horse I'll get next. I'll probably wait until after I get the new horse to get the saddle, so I can make sure the one I get fits.
I like the idea of the adjustable gullet option. You never know when/how you're horse is going to change build, or if you're going to get another horse (like I'm doing). It just seems more convenient.
I LOVED the look of the Bates Momentum (not sure if it had blocks though), but it's a bit out of my price range. So maybe I can find it used, and any of the other Bates look good too. I think I know a girl at my old barn who has one... maybe I'll see if I can sneak a ride in it sometime on my new horse (thanks for the idea reachthestars!)