I am a fanatic for Bridgestone bikes of that vintage. But, that is a lot of money for an XO-3. Objectively, Bridgestones are really no better than any other good Japanese bikes of the time. The markup comes from their cult status. And an XO-3 really does not carry too much cult status. So, I vote for considering the AD. Or better, wait for the bike to come along that meets your desires more squarely.
jim
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Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...
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SB forever