I disagree. Davids showed for a long time how good he is and he has at times carried the team. Appiah has showed nothing, really. He has never showed anything but crap for Juve.
D'you seriously think that we'll get Cisse, Zlatan, or Adriano? I don't, so Kezman has to be considered because he's on that second tier which might actually be available.
Kezman is a much more complete striker than Inzaghi, the comparison doesn't hold. Kezman is better in the air, dribbles better, finishes better, and shoots from range better.