Nikon N90s/F90x is a great camera. I own 2 one with battery grip. Fast AF, accurate spot meter, good battery life, good fps if you need it.
No AF point selection, it has two modes wide and narrow.
Backdoor's rubber coating gets sticky and flakes off in time. You can find lots of info on it on the internet.
It has limitations with Nikon G lenses I suppose. No M mode if I recall correctly.
I would only consider giving it up, if I find a very very good bargain for F100 (because it is much modern equal tech), otherwise it is very good at what it does and I don't feel the need to upgrade.
(AF speed with 85mm F1.8 is truly very fast)