Assuming De Ceglie is coming in to be the reserve LWM/LWB as the case requires, I'd rather not load up the left side with inexperience or inadequate (Molinaro) players.
In terms of skill, experience and suitability, my preference would be this:
Zambrotta, Grosso, Bridge, Pasqual, Dossena, Vargas (I think he's quite overrated, personally)
Zambrotta and Grosso are the best options for obvious reasons, but I would definitely not discount Wayne Bridge.
Just because a lot of Brits come to Italy and fail does not mean they all will. Ranieri may not be the best coach, but he is a very good judge of talent, and Bridge is certainly a talent that is languishing in Chelsea (as is the frequent case - just look at the mess Ivanovic bought himself into there).
He has international and CL experience and would be a good addition to the squad.