Personally, I wouldn't buy a used unit. No true way of knowing if it was maintained properly, so you don't know how much life it still has. You should really give Mark a call. He's a sponsor of this website, sells quality equipment, and he's in Califorina. Here's a link to a unit he sells that you'd be interested in.
http://pressurewasherzone.stores.yah...ilmounhot.html