Thrust by Herbie Hancock is my favorite from his 70's funk era, much credit owed to his badass rhythm section (Paul Jackson on bass and Mike Clark on drums). The deep grooves on that album are ludicrous. Yes Headhunters is an absolute classic but Thrust is the one that really turned me on to funk/jazz fusion. Apparently the entire thing was only recorded in a few takes which is amazing though not all that surprising.