I've located a Ferris Z1000 61" deck mower that is at a local Ferris dealer. It is a leftover model and has never been purchased. It has the full factory warranty and has been stored in doors the whole time until the last couple months when the dealer took it from their distributor in an attempt to sell it. They said the distributor was originally asking $6000, but had priced it recently at $5000. What is a fair price on a unit this old (I'm thinking 2005-2006 model but the dealer wasn't sure) that has 0 hours? Are there any known issues with this model?