I would have to decide among the following:

Queen - Another One Bites the Dust
DJ Icey - Frequent Yet Vague (I kinda dig techno as entrance music ala Kessler, but I spin breakbeats.)
Air Raid Siren or Tornado Alarm (just the loud horn noise would be bad ass)
AC/DC - Hells Bells

What would be your intro?

Canibus- Second Round K.O.
Brand Nubian- Punks Jump up to Get Beat Down
Lemon D- This is Los Angeles (If the fight was at the Staples Center)
Roni Size- Snapshots 3
Nujabes and Fat Jon- Battlecry
Atari Teenage Riot- Deutschland has gotta die!!!!

It seems we have one of these threads every month. LOL. But they are always fun.

I would contract The Game, Jay-z and Tom Hanks to collabo and come up with a tight ass song for me to walk into and I would have them walk with me down the ring while they performed the song. I would then stop half down the aisle, stop at the steps, and stop at the ring side and do a pre-rehearsed dance shuffle with all 3 ala Spinks and pray to God I don't get knocked out.