"good deal" is very subjective.
I too think it's on the high range of reasonable. I wouldn't pay that much for it.
However - you are the only one who can judge what a good deal is. If you really really want a 250x, and they are very hard to come by in your area, and after many months of searching and searching this is the best deal you've found, and you REALLY want THIS bike because of the shape it's in, the color, the year, the mileage, the lack of mods, and proximity to where you live......then you have to be the one to decide if it's a fair price.
Take $4000 cash. Offer that. See what happens. Winter is just around the corner. As is another calendar year.
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2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs