I like Irvine, Grunbeld, and Rakshas. Even though Zodd is an apostle, I never really seem to lump him with the others when I think of apostles. He is pretty cool, though.
Never cared much for Locus, for some reason.
Irvine, because archers are cool and he's the most badass archer ever.
Rakshas, because he's the scariest guy imaginable.
Grunbeld, because I wish I was a twenty foot tall hammer wielding fire-shooting bastard.