Advice wanted on purchase of 16710 GMT

[Geo444]

I currently have only a two watch Rolex collection. I am considering adding a third which would be a 5 digit GMT master with coke bezel. Currently prices are in the 9 thousand dollar range. I would also like to add a speed master moon watch to the collection. Having a explorer II and a submariner already I am not in a huge rush to buy the GMT. With Rolex prices and demand near peak would it make more sense to pull the trigger on the speed master and look for a GMT at a later date after the Rolex market cools down a bit. Or are the earlier GMT's destined to continue to appreciate. I know no one has a crystal ball but any advice would be welcomed and appreciated.

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