Quentin. When they had the short TV spot after the last episode where the Carver is talking about being "10 steps ahead" of everybody...the person talking was clearly the dude that plays Quentin. Even though his voice is disguised, his manner of speaking wasn't changed at all (the pauses between words, etc..).

oh, Season 3 has been kind of weak overall, nowhere near as good as the first 2.

Edit* Even in the little video on his myspace you can tell it's him.