Definitely suggest EP 90: How Lonesome A Life Without Nerve Gas.
Other ideas:
EP 183: Beans and Marbles -- Not exactly space opera, but it has space ships. And coffee
EP 181: Resistance
EP136: Bright Red Star -- pretty dark military SF.
EP116: Ej-Es -- great story as long as he doesn't mind sex in SF.
EP 78: Shoulders of Giants, maybe. Kind of a throwback to the golden age of SF.
EP 01: Imperial -- great story, ditto sex in SF.
ETA: Clarification - EP 90 is GREAT.