Actually, the Honda Rebel CMX250 came out in 1985.
The CM185T was from 1978-1979, which was called the "Twinstar".
In '80-82 they made the CM200T "Twinstar" and '82-'84 was the CM250 "Custom". 1981, the one I have, was the first year for 12v and a CDI.
I have heard that the '78 XS was the most popular.