How is that comical, Square? He may not be the best centre back in the world, but he's undoubtedly one of them, with only the likes of Nesta, Maldini and Puyol ahead of him right now. When on form Stam and Chivu are about as good imo, but Samuel is still an exceptional player.
Roma need to sell, and we need to get defenders, so why not Samuel? Believe me, I hate Roma just as much as any of you people on this forum, but that doesn't stop me from seeing that Samuel, Chivu, Mancini, Totti and Cassano are brilliant players.
The likelyness of this happening is very remote, but if there was half a chance that we could swoop in for Samuel we'd have to give it a shot. Imagine having Samuel and Mexes or Ferrari in central defence next season? Our backline would be just as good as Milan's, and younger!
As for Cavenaghi, he definitely seems like something special for the future, but would you be content to rely on such a young prospect to lead your attack? At Parma or Chievo maybe, but not Juventus. We would have to loan him out for a season or two first.