I’m surprised that no one has chosen RM’s best seller the RM011 yet, unless the OP only wanted us to pick from his limited list. I was thinking that this topic was for barebone time only RMs as in no other features other than basic time, but I see the RM010 listed numerous times and it includes a date feature. A chronograph measures time, so that piece should be a candidate as well.
My favorites that are realistically obtainable
in my lifetime, in descending order:
RM004 v2 Ti
RM011 Ti
RM010 Ti
RM010 WG
Favorite cost no object, descending order:
RM056
RM038
RM035 (can’t justify price for what weighs as much as a plastic toy and needs
see through crystal on reverse, although case size, straps, and overall design are
show stopping.)
RM039