I picked Hutch, just because of all the different contexts in which he played. His albums as a leader as great. He did a lot of great work as a sideman - with Jackie McLean, Grachan Moncur, Grant Green, Billy Mitchell, Prince Lasha/Sonny Simmons, Barney Kessel, Stanley Cowell, Lee Morgan and on and on and on. My interest in Bobby Hutcherson has helped me to discover countless other wonderful and exciting musicians.
Walt Dickerson is probably my second favorite. I just bought some of his 70's work on Steeplechase, and while it's a bit more difficult for me to listen to (quite free), it's still pretty good. Of his 60's work, "Relativity," "Impressions of a Patch of Blue," "Jazz Impressions of Lawrence of Arabia" and "Unity" are all really excellent. I listen to them all the time.
Lately, I've really been digging Roy Ayers' 60's work, with Curtis Amy, Gerald Wilson and as a leader. I really like his sound.