What lenses you have for your D70? If you already have a collection of lenses, it make sense just to upgrade the body to like D7200 etc.
Otherwise, Fujifilm X-T10 is a good choice if you go for the kit with XF 18-55 lens. You can't get any better with kit lens than this one.
I've been using Mamiya with Leaf back, Nikon, Olympus and Fujifilm for long time. If you ask for all rounder, I would say Fujifilm. It's easy to manage the photos after you've taken them as well.It's not for extreme sports or portrait, that's for Nikon. It's not purely for landscape like Leaf back. Or an light as Olympus ones.