Zero Turn Recommendations

I currently have a zero turn JD Z375r with a 54 inch deck. I have about 5 acres to cut of relatively open flat land with some bumpy areas. The lawn mower has been great and I’ve had it the last 7 years and just do the standard maintenance and I changed the belt at the start of this season.

I am thinking of upgrading but would want something with a bigger deck to cut down my cutting time. It takes me about 3.5 hours to cut currently.

Which models do you guys recommend?