I currently have a gmt master 2c and a omega man on the moon. I basically only wear the rolex on holiday and the omega is my daily watch usually and after wearing the 42mm omega for so long i am now thinking flip the 40mm gmt and get the new biggr sea dweller. Have a good friend who wants to buy my gmt right away its a 2015 model and pretty mint condition i would say. What would be a fair good price for both of us ? And how long roughly are waiting times for the new red sea dweller?