One word of warning joe_bass as I was keen to try out Sadowsky, and got the chance at GuitarGuitar in Edinburgh a few months ago.....
They are great basses, sound-wise and build-wise. In fact, owning a couple of custom build, I can't believe that Sadowsky's are man-made as the fit & finish was so perfect, even on the Metro.
I prefer an 18mm, or even 17mm string spacing and the spacing is 19mm on Sadowsky. The neck, to me felt wide & flat compared to what I prefer.
You have a Thumb 5 and MM 5 and, from what I remember these are 17 or 18mm spacings so, IMHO I wouldn't just buy blind. You need to try one of these out first to know you like it.
Oh yeah, good luck !