I recently purchased the blue dial YM and of course, prior to buying I went on a hunt online to read about it as much as I could. Across forums I saw a handful of people regret selling their YMs often saying it was their most comfortable watch and had something special about it.
I'm not saying you should keep it, just providing some perspective. Based on your current preferences you might be leaning more towards dressier watches with more ergonomic cases which the GMT does not have.
Have you thought about buying the day-date pre-owned? Plenty of reputable gray ADs out there...