I don't know if choosing the opening band for Opeth is up to you, but all of us would HATE the band DEVILDRIVER to open for you on your next U.S. tour. Just check this poll and see it for yourselves:
http://www.ultimatemetal.com/forum/showthread.php?t=128143
http://www.ultimatemetal.com/forum/showthread.php?t=128143