Givet/Barzagli for the back. Juve have alot of excess than can use as leverage to take Barzagli from Palermo. Miccoli being the most obvious. Givet would be relatively cheap, and is definetly an upgrade to Boumsong with the potential to be great.
Mascherano, I cant c him wanting to go to Liverpool. Italian football/culture is much more suited to him than England. In any case, if were unable to sign him, Sissoko is a very bright prospect.
Nothing needs to change in the attack unless Trez leaves. Unless he is sold, all these Huntelaar, Klose, Robinho rumours r pointless. Lets not forget about Palladino and Bojinov, both of which can cut it in serie a imo.