Casting Macbeth

I would have no clue to who would be a good choice for the roles of Macbeth and Lady Macbeth, just as long as Humphrey Bogart doesn't play Macbeth(because he died in 1957).
As to what they should be like, the actor playing Macbeth needs to be someone that can be caring but have the ability to harden his heart. And Lady Macbeth needs to be very strong willed and have the ability to deceive people.
Glenn