You should add the RT Pro to the list, not to be confused with the classic RT. It was similar to the ReTro, but I forget the difference. Most differences in the non-classic, RT type valves was either an aluminum regulator and/or aluminum valve body (but not power tube), and whether or not the on/off top used one or two orings.
Some of the micromag valves had smaller dump chambers which makes them a little nicer on CO2.
Zak has a few tidbits. AGD Valve Info