Philly,
We're not the real experts on used equipment pricing. It's tough to estimate used value because each market and each region is different.
Your local Exmark dealer should be able to give you a "ballpark" of what it's worth. I did look at the "pre-owned" section of our website and there was a 48", 15 Kawi with around 30-50 hours for $2200 if that's any help.
Thanks
Terry