Man, as far as NES music goes, the level 1 theme for the first Batman game has got to be some of the best ever made. It's has an insanely awesome melody and kickass beats. If someone would feel like mixing this up, then I'll just go ahead and recommend metal or techno as an approach.
Seriously, just check it out! http://www.mediafire.com/?sharekey=7fdd1857b846fd4dc79b87b207592a1ce04e75f6e8ebb871
Alternatively: