>>28545584
Depends on what you want
Air cooled
>DR650 or DR variants
>XR650L or XR variants
>KLR650

Liquid Cooled
>DRZ400
>XR650R
>KLX300

If you're willing to go a little older, I think some WR series bikes will fall into that price range. If you care about aftermarket, I would just get a DR, XR, or DRZ.