from perspective of someone who still using N900 but display (touch) again acting weird and also thinking about new one.........
Why another N900? Well, it's good and it's cheap. Why not? Well, it 's most likely fcuked up one way or another.
Why Neo900? For me, there's no reason. I'm not following it closely, but if 3.5" screen is the only option than that's enough. Since you like to tinker with them much more than I do, maybe you can find yourself in one of them. But when is it coming?
Why Jolla? Well, it is kind of like logical step and if I did have 400€ a year ago I would probably buy one. And because it isn't tied to gazillion online services that I don't use. Why not? Well, because of everything that can be found about it here and on the net about it. OK, still the most wanted one on the market but I still can't justify 350€ for it. Why? Because, while updates are coming and Jolla is trying I'm not sure that their strategy will turn out in the way I was/am hoping. Simply put, they talk to much about android support in sailfish and porting sailfish on android devices.
Since at the moment I need phone only as a phone, I have 24/7 acces to laptop and internet and for killing time when I go somewhere I have tablet with The Pinball Arcade on it and it is 3G so I can use it for browsing I would buy something cheap, like Moto G or something like that.
But If I would have 350€ to spend, then Jolla despite of everything.