Anything, ANYTHING by [a href="http://www.youtube.com/user/Kikoskia"]Kikoskia[/a]. He's just delightful to listen to. Strikes you as the type who's not really trying to be funny, he's just being himself, and happens to be the sweetest, funnest guy around to play video games with. The sheer breadth of his material is staggering, too. RPGs like Icewind Dale, the original X-COM games (he has two LPs of that--one regular and one SUPERHUMAN ANTARCTIC CHALLENGE), Sid Meier's Covert Action, most of the Doom games to date (Doom 3 is particularly amazing)... both versions of Action 52...
Check him out. I guarantee you'll find something you like.