Too much. Maybe close if the entire cab has been gone through recently but still a little high. For $1000 I'd expect a near flawless cab and artwork with recapped monitor, fully working PCB, maybe recapped power supply, etc. Prices are on the rise but unless it can rival a "restored" cab then I think that's high.
Check the bezel for scratches, the CP for burns & cracks, etc. I wouldn't want any of that for $1000.