As for the choice between the Titanium and the SS, this is another story.
The Titanium is superb with its grey case and its ruthenium dial.
Its alarm sounds a bit higher, in a more crystaline way, but the difference is sublte, and can only be heard if you make an instantaneous comparison between the SS and the titanium.
I would say Titanium, well, in fact, i don't only say, because this was my choice.
The only small thing is that the Titanium is a bit more expensive ( Titanium grade 5 ) than the SS.
Finding one BNIB is still possible ( it was a LE of 1000 pieces ),as I know where there is one for sale, but I think you know this place very well, too...

Here is mine:

Whatever the version you finaly choose, you won't go wrong, as it is a great watch, indeed!
Best, and keep us updated!
Nicolas