Well, I was fortunate enough too to get a few signed. Unfortunately I left behind my DMM 'Speak Like a Child' but did get 'Maiden Voyage' signed on the sail !
'The Prisoner' just about squeeks in with my vote, much as I like 'Speak', 'Maiden Voyage' and 'Empyrean'. Like 'Speak Like A Child' this has very telling Gil Evans influence with the unique alto flute/bass trombone/flugel combination, with warm sonority. Only Duke Pearson seems to have exploited this area of orchestration as constructively as Gil and Herbie.