My advice would be to assess the current owner. When I was shopping for a used Monster in 2008, most of the newer used ones I found had been flogged, left out in the rain, etc.--they were overdue for expensive services so the owners were just dumping them. Others had been stored inproperly in garages for years. Here they were overpriced so for just a little more I bought a new one.
Keep us posted and let us know what you get!