I'd say you are on the right track. Now is certainly the right time with the remodeling underway. There are newer valves on the market that are far better than they were 13 years ago. There are of course several brands to choose from, and most of us have our personal preferences, but you can get a valve that can control temperature, flow volume, be anti-scald, and be very nice looking. My personal choice is the Delta 1700, but that's not the only good one. These are not especially difficult to DIY install, but if you're not comfortable with DIY, then a plumber could do it without requiring a second mortgage.