Nikon R 10 is said to be great and one of the best Super 8-Cams ever built (I never owned one myself), but it's high end, not mid-range.
May be the Canon Autozoom 814 ( all metal and mechanic, but heavy - but not as heavy as the Nikon R 10!) or its successor, the Canon Autozoom 814 Electronic (more electronics, not so heavy but more facilities ) better match the description given by Alessandro Malfatti? Both cameras offer manual exposure. The lenses are great.