Steve Harris (The man who got me to pick up my Fender P-Bass), Eric Langlois, Les Claypool, Cliff Burton, Lemmy Kilmister (I know he plays pick, but damn it he's still good), the bassist from soilwork, david ellefson, sharlee d'angelo (please see Lemmy yuou blokes), Steve DiGiorgio.
as a sidenote, i would also like to add micheal manring, i had a chance to see him perform at my local guitar center, and my goodness, the man isn't human.