I wouldn't want a narrow gearbox if I had to ride pavement to the trails. (Personally, I don't like a narrow gearbox when I'm in the trails, either.) That would rule out the Husky.
If you think a KTM/'berg is too expensive to maintain, why are you looking at a race bike with lights that only holds a quart of oil?
I think you've got a lot more options than you realize... if you are looking for new, try and find a leftover that meets your budget. Don't rule out shipping a bike if you find one far away.
1989 NX650 (for sale