Let me preface this by saying I've never owned or operated a 72" mower. That being said, I would stick with the 60" just because of the power to cut ratio. Otherwise, get one of the big commercial outfronts powered by a big diesel with a 72". That would probably be cost prohibitive. <p>I'd buy a 60" that I knew would perform at top operating speeds. Just my two cents without any 72" experience to draw from. Have you tried the Ferris with Independent Suspension? That would be good for riding long hours. Has the lowest center of gravity in its class, which would help if you mow hills. I like it, but you may prefer something completely different. I can give you a number for the Ferris, too if you are interested. It's about $200 more than the Toro price I gave you.<p>John