The Bluesmaster is a good choice, and a happy medium for all those sounds.
Adjusting the trim settings on it will get you more or less to all those territories.
Apply some thought towards speaker selection though; you may have to lean on one side of the fence.
An alnico speaker (ie Celestion gold) will give you the character you want for your U2, Kings of Leon thing but won't really nail the tone you want for Metallica, Dream Theatre.
Discussion on speakers for OTS here:
http://ceriatoneforum.com/index.php?topic=1041.0