I think a lot of them wore (and probably still do) the Gold Speedmasters that they were given by Omega. Saw a recent picture of Aldrin, was still wearing a stainless Speedy. I would believe they would be somewhat attached to them given the history. The NASA inventoried Speedmasters that have actuallyEver wonder what they'll wear once they make it back there? G-Shock is most likely because of budgetary reasons and durability.
"Flown" are bringing insane money.