| That's the problem with nostalgic items; they're only worth what someone wants to pay for them.
IMO $575USD for what sounds like a rather "used" 97.1 is too high. If you really want a Concept piece their aren't as many out there as the identical HCCA150 (came out in the full HCCA lineup the following year) and the HCCA425 (both of which are much more plentiful and pop up on Ebay and the forums fairly frequently and go for much less than $575USD in nice condition).
I say get two more 275G4's and use them for your comps. Four 275G4's side to side across the trunk would look pretty nice with a 97.2 in there also. You can always polish the 275's to match the Concept piece also if they aren't already the polished one's. | 
