Just to name a couple:
My favorites are (in no particular order) always Urijah Faber(#225), Ronda Rousey(#168), Tito Ortiz(#247), Dana White(#327), Dr. Carl Hart(#469), Tim Kennedy(#497), any of the fight companions (even if you don't have the fights, they are still entertaining), Gene LeBell(#423), both of the Tj Dillashaw and Duane Bang Ludwig ones(#508 & #385), Joel Salatin(#479), War Machine(#454), John Hackleman(#444), and Duke Roufus(#514). Also the Rickson one(#524). These are all JRE and this list is heavy in MMA. If you want entertainment, just listen to most of them. Go backwards. There are a lot of episodes so just go to Joe's podcast site if you want to look at the rest. I also re-listen to these sometimes on EBR: Geo and Richie Martinez (#50), Joe Rogan (#53), Kelvin Gastelum (#55), Shayna Baszler and Jessamyn Duke (#45), and Jeff Glover (#60).