Gas Gas EC250
also available in a 200 or 300 flavor. Road legal in most of the world... not in the good ol' USofA. Some were marketed in the states as XC as opposed to EC but they are, aside from very minor differences (such as the size of the flywheel and some of the wiring), the same bike.
From my owners manual:
That's a wide enough spread for my needs. the motor could pull taller gearing from the bottom but I never feel the need at the top.