Your typical big blue is on the 2-600-ish scale. If everything else is excellent I'd put it in the upper mid range of that. The downfall being, who the hell has a spare marquee topper for this cabinet?
I don't have much real world experience with this particular big blue. Does it look like the topper was bolted on? It wasn't ripped out or anything? No one damaged the wood taking the thing off?
Edit: yikes! I was afraid of pricing too low and getting slammed for it.