Leonardo DiCaprio-everything he does seems to be gold.
Ryan Phillippe-this is more of a 'because he is eye-candy' thing, but i havent seen a movie of his that i didnt like. since Cruel Intentions I have been hooked.
Kate Winslet-everything she does seems to be gold as well.
Strangely, my least favorite film of both DiCaprios and Winslets is Titanic.