Rob Dukes (Exodus)- He was pretty nice when I met him.
Jim LaMarca (Chimaira)- Hung out and talked for a good 10 minutes.
Chris Clancy & Andrew Jacobs (Mutiny Within)- I've talked to these guys several times. The other guys in the band are pretty antisocial though.
Jim Florentine & Don Jamieson (That Metal Show)- Their not musicians but I thought I'd mention this anyway.
CorpseGrinder (Cannibal Corpse)- He acts like he's just part of the crowd and is always willing to talk to fans.
Dave Mustaine (Megadeth)- Wouldn't personalize books or take pictures.