What are the best quality brands of home bath shower thermostatic
valves?  I do not want just a pressure-compensating valve, but a true
thermostatic valve that senses incoming water temperature (not
pressure) and self-sdjusts to maintain a constant temperature at the
shower head.  Symmonds?  Moen?  I am interested in absolutely top
quality, not "contractor grade" or equivalent.  A two valve, Euro-type
set-up, one for flow, one for temperature, would be OK.  Model numbers
would be appreciated.