The Toro Prolines like the 22197 and 22198 are very popular around here and are built like tanks. I also would look into the Exmark Commercial 21, the new one they came out with two years ago. I used them and love them, they mulch well with the new Exmark blade on it and bag like no other. I was talking to the guys from a local LCO today and they are running the S Series self propelled models and love them.
Snappers are good too and are cheap. Hondas I have a mixed opinion on as some people love them and some people hate them.