In reply to Richtw: I don't personally use the VCS/Verde/Blanco (heels just do not fit), but it's worth trying the online bananafingers shoe size calculator - as long as you know your size in a given model, it is pretty accurate (I've tried and tested on all my shoes/new shoes tried on in shops).
Would however point out that it assumes a perfect fit of the shoe to your foot shape, so for the 5.10 Dragons and the Blancos (tried on in a shop), I had to upsize from recommended/calculated size to account for the non-fit of the heel and still get it super tight across the toes: the bottom line is, try them on if you can!!