In a joking sense I would like to see Johnny Depp play James Bond purely out of curiosity. In a realistic sense I would like to see Daniel Craig play him again since I feel he plays a fair James Bond.
If I had to seriously pair the next lead man and woman for the new film, I would say Matt Damon & Angelina Jolie. ( both are used to making action films, and they can pull off the attitude, and look).