Who we need to really challenge

Could work, but we will have to release a few players first. I say Squillaci and Chamakh

Chellini would be 20mil+ signed a 5 year contract in 2010 quality player though,can't see him leaving Juve loves the club.

Chellini?? Why do we another CB, Koscielny will struggle to get in the team once we have full backs.

Sow. Over-rated, vastly, by some Arsenal fans on here. Plus he will be in Africa for January and February.

De Rossi, we have no chance of getting him.

Chiellini coming in allows Verm and Kos play FB, where we'll be thin all year andf adds to rotation options. Not that I like it to play Verm on LB, feel a bit better about Kos on the right.
Sow is an imposing player, not sure where the over-rating comes from, he scores with his eyes closed and puts constantly pressure on defenders. Guess you haven't seen him play too often. For me he is the ideal guy next to RVP and I think it would work wonders..
De Rossi won't be easy to get but he would add steel and creativity, also scores quite easily from midfield.

Chiellini would be one of the most expensive defenders in the market, not just due to his quality but also because of how defenders are valued in Italy and because Juve aren't a selling club, meaning they wouldn't be likely to listen to any offer that wasn't ridiculously high.

I'd like to see us get Vertonghen (sp?). He is pretty versatile as he can play across the back four (though CB is his preference) as well palying as a def midfielder. Added to that he is best mate of the Verminator

Sow is an imposing player, not sure where the over-rating comes from, he scores with his eyes closed and puts constantly pressure on defenders. Guess you haven't seen him play too often.
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I have seen him play very often. He is not the answer.