Man, Barca-Chelsea will have everything. Two teams super strong in every position. No way it could be boring. Messi and co. will have to try twice as much and every great move by Messi or Henry will be much more attractive and worthy when you know that they did it against world class players (not Boumsong or Breno). Everytime Essien or Carvalho win the ball it will be much more attractive and worthy because they'll do that against Xavi and Messi.
The only thing missing in that match will be Jose Mourinho (and maybe the younger Ronaldinho).