If it is more of a bumpy ride, I would take the time to take a test ride on a gravely ztr with the air ride, rubber mounted seat. I find it very impressive.
John Deere 5325, CI Farmall 85U, Mccormick International 404
Check out Dixie Chopper. I cut around 4 acres a week and had mine for 4 years. I have had zero cost for maintenance other than changing oil and blades. Also they are very fast.
I ended up with a Deere z930M 60" deck with the full suspension seat. I test drove many different ones and this was the most stable on the hills around the farm. I really like this new mower.
Enjoy. I have the z465 60" residential type Deere mower. I now about 7actual acres of mostly flat and only some bumps. Its been great. I'm sure your 930 will be even better. You can never go wrong with a Deere.