Although it hasn't been produced since 1981, the Cessna 180/185 series is one of the most iconic and desirable models of the Cessna taildragger aircraft line. The links below provide some great history and describe some of the differences between models.
The Cessna 180/185 Year Model Changes From 1953 Through 1985
AOPA - Cessna 180
The C-180 Story
Also check out the following link for some great air-to-air photos: http://deancully.com/f955491957