Matt Smith being adorable. In order to be the doctor: Use the word Wellllll. Combined with the Matt Smith effect (see photo above). Run around yelling DALEKS. Your Doctor lesson for beginners is complete.
Donna and Rose. Always Donna and Rose. Martha is wonderful, but she isn't the "save-the-Doctor's-ass-because-he-can-never-save-himself" type. And Amy is wonderfully headstrong, but there haven't been many opportunities for her to save Eleven.