Difficult.. Very difficult.. Gary Cahill is the most obvious one, because we don't need to wait for him to "adapt" to the Premier League because he's already used to it. He's got a good header and a good tackle, his pace isn't half bad too. The problem is, imo, he's very small for a defender. While I don't expect central defenders to be big, butch, and powerful, there is a certain expectancy they can go shoulder to shoulder with the likes of Ibrahimovic, David Villa, Benzema ect. I think in one-on-one challenges with these types of attackers, they'd get the best of him. David Luiz on the other hand is much stronger. From what I've seen, he's got a great crunching tackle, his headers are good too. The fact he's been called up to play for the Brazilian national squad shows he's one of Brazilians up and coming stars, at the age of just 23 that's quite an accomplishment. The trouble we would have, is the "Ramires issue", how long will it take for him to adapt to the demands of the Premier League and moving to England. The hefty price of £30million is quite off-putting too. To be honest, I haven't seen much of him (don't follow Portuguese football). Kjaer. Got no clue.