I found out Greg Cipes was fired from Warner Brothers, and that's disappointing. I know that Josh Keaton, Jason Griffith, Cameron Bowen, and Robbie Daymond would be the perfect actors to succeed as Beast Boy. They could all sound very similar to him, if not spot-on.
Josh Peck, Wayne Grayson, James Arnold Taylor, Dee Bradley Baker, Jess Harnell, Chris Edgerly, Mikey Kelley, and Jesse McCartney would also be great voices for Beast Boy.