I'd either hire it our or buy a low end commercial unit (new or used). The big-box store residential models don't hold any value and will not last nearly as long. If you buy a commercial unit and end up moving, you can sell it more easily. The guys just starting out in lawn maintenance are usually on the look out for such equipment.
I recently bought a Hustler Fastrack SDX and it has really cut my moving time down on my 2 acres. It has all commercial parts that are serviceable and will last me for the rest of my mowing days.
