Norwood Fisher from Fishbone - Bonin in the Boneyard, Lemon Meringue, are pure class
Muzz Skillings of Living Colour - Funny Vibe, Time's Up, Deperate People
Colin Greenwood of Radiohead - very tasteful
Is Peter Hook underrated? I like most of his stuff but what he did in Joy Division is timeless IMHO - She's Lost Control, Digital, Dead Souls, etc.
Anyway those are four of the players who most made me want to play (other than Flea)
There's a few others that have already been mentioned here - Jack Bessant of Reef, Cass Lewis, Bill Gould, Andy Rourke