I have the 60" HC which gives an uncut circle of 6". If you want AWD/AWS then X739 is the only option, except a used X749. Based on previous posts, it does not sound like there are any new X749's still in the system. Diesel may be more fuel efficient, but reportedly by dealer also a bit more noisy. Only have 8 hours on mine, but very impressed. Lots of power, better ride and quieter than previous 25HP BS Craftsman. Cut actually seems to look better than 72" MMM 7-Iron on 3320. Power steering is great upgrade from previous. Have not had any need to remove deck yet, so cannot comment if it works as easy as the videos. Also no need for me to load it with "tractor type" options, since I have the 3320, so no comment on those things. Craftsman had a key override for reverse. Will probably jumper or wedge the JD eventually, but so far not that much backing up so have not bothered. With limited use to judge, I would not be willing to give up either AWD or AWS to move to diesel. DW does not like diesel fumes, but does like to drive the lawn tractor around with a cart, so she is happier with gas. Almost instant starts with the fuel injection. For me this was basically a giant yard toy that was a want rather than need, however, once past the price tag, and when used within the design limits, I think the x739 is a great machine and would highly recommend.