tl;dr: a Fujifilm X100F.
I've bought an almost new (less than 500 shots) Fujifilm X100F, taking the risk of having it sent with an international courier. My courage paid off.
I wanted something that I couldn't expand, no additional lenses or other accessories; I wanted an all-in-one solution to always bring with me, without caring of what would be the best fit for a situation or always affecting my (already low) budget to buy a better piece for it. Also, I wanted something really small, and this, amazingly, I can fit it into a pocket - maybe not a jeans' pocket but still.
So far, I am incredibly happy with my choice. I had the chance before to use an elder model (X100S) and this upgrade made my new toy perfect for my needs. It is still of course early for a full review - which I won't do anyway and you can find everywhere online. You can read more about the model here.
Of course I took the black one :)