If you had asked me a few years ago, I would've instantly said ANATO, but in the last year or so, I *really* got into Queen II, and it quickly grew to become a favorite of mine. It's not often a band's second album becomes an instant favorite of mine (outside of obvious ones like DT's Images And Words, and Kansas' Song For America), but they really put a lot of great music on their sophomore effort.
-Marc.