From the list... probably have to say Metallica........... They're all great bands. I like them all. But I personally listen to more Metallica than any of the others so I have to say them.... Doesn't make them a better band than any of the others though.

Other Favs

New Rock Band: 10 Years, Mars Volta
Modern Rock Band: Queens of the Stone Age, Tool, Chevelle
Acoustic: Dave Matthews, Jack Johnson, John Mayer
Blues: Joe Bonamassa, John Mayer, SRV
Classic/Oldies: Creedence Clearwater Revival, Allman Brothers, Beatles

my favs in a nutshell... probably forgot a few...