Replacement for shower hot/cold water mixing fixture

I wish I knew too. Most of the high end units have used either Moen or Delta valves. The problem is both of them are behind the wall and don't have the normal RV setup. In my research a couple of years ago i did come across a really high end fixture that was surface mount. Trouble is it cost around $1500. So i ended up going to the RV store and bought one of those fixtures with the "L" handles and an oxygenics shower hear. Best investment i could make to my shower experience.