You can look it up on Orion Blue Book or maybe try searching sold prices on Ebay.
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I'd do it as long as the dm600's and the dm 60 were s3 models also. You want them all to be of the same generation so they match up tone wise. I think $900 is a fair price. If his asking price is $900, offer $800 and go from there, but I do think $900 is fair. By the way, what made you think that price was high? Did you research used sales prices or did you just "feel" that price was too high because you just felt that way?