Nicole I too have a Nikon F90X (it seems we are camera-mates!) which I have "retired" in favor of my Hasselblad and I also have a 38 year old Nikon F.
Maybe you should look for a Leica?
I can't think of any other system that has what you describe and has maybe better lenses than Nikon. I don't have one so I can't offer any more details.