26400io questions

[rolex16]

Hey folks, I want to buy a 26400io, and this will be my first AP. I have a few questions though:

- when was the steel with white/silver dial discontinued? Would ADs or boutiques possibly still have old stock? I am debating between that and the titanium version. Opinions on the versions welcome, particularly if the titanium finish holds up, can be polished easily and well, etc.
- I used to have a deep sea sea dweller and wore that without problems. How does the fit compare, will this wear significantly larger?
- if I find either the steel or titanium in an AD or boutique, is it worth it to purchase at full price new, or should I go grey or used? I don’t see a lot on the grey market right now, but when I do see them, they are anywhere from mid to high $20s, but new from boutique would be mid $30s after tax. I am also thinking about a 15500 black after this, but probably not much more after that.

Thanks