I still use a shindaiwa t270. One that has not been mentioned is a echo SRM 2502. I have one that is probably 20 years old that still runs great.
Bailey Lawn Service of Tulsa
61" turf tiger with kohler efi
36" scag v-ride
Shindaiwa t-270, eb-630
Scag giant vac w/ 18 hp vanguard