Will Smith in I am Legend and Tom Hanks in Cast Away. Only those guys can execute it when half of the movie is just them and their thoughts.
I would take Will Smith and everything he's done as my favorite actor and body of work.
Tommy Lee Jones
Any movie with one of those actors in it, I will almost certainly see the movie without regard to the plot. For example Deja Vu would not have interested me, but because it had Washington in it, I watched it and loved it.
I also like Tony Scott for a lot of his things..mostly with Denzel Washington though.
Him and D.Washington seem to work together a lot...some of the better ones from him:
Man on Fire (one of my all time favorite movies)
Taking of Pelham 123
Enemy of the State
And he's got another one called Unstoppable in post production with...guess who...Denzel Washington
Have you ever seen the director's cut version?