I'm having my shower redone and was thinking about replacing my current Moen Posi Temp valve with a new one while the wall was opened up. My only concern is about the quality of new valves. My current valve was manufactured around 1998 when the house was built. Are the new valves built as well as the older ones? Does Moen still manufacture their valves in the US with quality parts? Should I replace the valve or is it better to just keep the older valve and replace the cartridge? Thanks in advance. Jeff