Who do you think is the best actor to play the Joker in the next Batman film (Christopher Nolan version)?

Since Heath Ledger's ping, God bless his soul, Ledger's version of the Joker, in my opinion, is the best Joker in years, he really captured Joker's sadistic nature, but since Ledger has ped away, who do you think is the best actor to play the Joker in the next Batman film?