Isn't the "convertible Cayman" the same thing as Boxster? Just like a "hardtop Boxster" would be a Cayman?
Just to clarify, when I said the Boxster no longer had an optional hardtop, I meant a removable hardtop as was offered on the 987's, though others like to euphemistically call the Cayman a 'Boxster Hardtop'...
Removable hardtops like this are no longer available for the 'new' Boxster.... But the soft tops are much higher quality than they used to be.
If you love open top cars, by all means go for the new Boxster, but the new Cayman has a much stiffer chassis, more horsepower in all configurations, more torque in all configurations, is quicker in all configurations, and (IMHO) is far better looking as well based on seeing them in person side-by-side...