5,300 as a starting price is ok, but if he won't move on it substantially i'd say you could get one cheaper... i'd throw 4,500 cash at him and walk away if he won't take it, then call him in two days... if not there are plenty of other bikes out there, but then again if he will move a little bit and you really want it i wouldn't let it get away for 200$ since you'd probably blow it in the mean time searching for another bike

and if you dont' already have a good set of gear, remember to set aside 500+ for that