massi.
4544
Let me say that, in my case, I ordered a black leather strap from B&S while I 'm still waiting for the EW arrive!
As for the Speedmaster 60th anniversary, switching from bracelet to a leather strap gives you a completely different feeling of the watch 
I simply prefer other than the metal bracelet (apart my twenty years old Sea-Dweller)
Take all the time you need: at the and, you always can find another home for this great watch.
Best, massi