Batman was my favorite, since he really didn't have any 'superpowers' he was just conditioned well. Also like the dark aspect of Batman, which was really done well in the last Batman movie with Heath Ledger as the Joker.
Started collecting books around the time Superman died, and when Bane broke Batman's back (Knightfall).
Still have just over 1,000 books - all in the plastic protective baggies. Some books I have of note are:
DC:
Action Comics 159 (1951)
Aquaman 2 (1962)
Batman 426 (1988) - Death of Robin
Flash 152 (1960)
Superman 75 (1993) - Death of Superman (Black Bag edition)
Marvel:
Amazing Spider-Man 37 (1966)
Amazing Spider-Man 100 (1971)
Avengers 11 (1964)
Submariner 5 (1968)
I've got my collection organized in a spreadsheet. If you are interested in any of them, PM me, and I can send you a list. As they say, everything's for sale!
-Z-man.