I just checked the salomon home page. with the z-12 speed binding, which is on a moveable plate size does matter and you're right about potentially being outside of adjustment range.
the standard hard mount z-bindings have no such limitation. my concern, however, is that i didn't see the z-14 in this years lineup. And, i didn't really find any on a quick inter-web search.
I've used the STH's too and have no complaints in fact its my understanding the sth heel is well respected and its again still way lighter than the markers you mentioned and unless you plan on skiing around, save the weight and probably some money too!
My proclivity for the z-bindings esp. on my carvers emanates from the ability to use a "removeable cap" made by bio-stance to provide some canting under my left heel.
I haven't seen this years bbr, but i know this years sth 14 are awfully blue like last years bbr's were.