Second the suggestion of "Takin' Off". I believe it is his first session as leader and the rest of lineup is gold. I have a bluenote reissue that sounds great. My favorite HH record. I would also give "Headhunters" a listen. More fusion than "Maiden Voyage" but not all that far out and very good to my ears. You might enjoy Horace Silver or Bud Powell as well . . .
Herbie Hancock-Maiden Voyage
I really like the above recording by HH. It is one of my favorites. Are there other good HH recordings before he got, well weired with fusion?