My vote goes to Cahill instead of Dann (i know he WANTS to play for Liverpool but who says Cahill does not want to play for us). He is fairly quick, a good header of the ball, good distributor and does get himself on the scoresheet.
With Agger on the treatment table, the aging Carragher, russian roulette Skertel (with his tugging and body checking at set pieces last season) we need a bit pace and presence within the team. there is also a certain calmness and assurance about his defending. No nonsense and hard as nails.
the only thing is that he is going to cost twice more for Dann.