My favorite English dub is for The Melancholy of Haruhi Suzumiya but there have to be mor, right? Sure:
- Death Note
- Fate/Zero
- Code Geass (except for Nunnaly)
- Fullmetal Alchemist: Brotherhood
- Cromartie High School
But seriously, check out Haruhi Suzumiya if you are looking for a great watch! Also you might want to start the list off with a re-watch of Ghost in the Shell the English dub for the movie is not as good as the other's that I have listed, but it will help you move into Stand Alone Complex, which is much better.
