I'm a bigger fan of Katie as Rachel myself but I guess I liked Maggie for having chemistry with Aaron because it didn't make me feel THAT bad for her choosing Dent over Bruce. I've convinced myself that the real Rachel Dawes (Katie) didn't make that decision. The real Rachel Dawes' conflict has always been to choose either Bruce or his alter-ego, Batman. Those were the only two choices and no one else. Of course, she has already chose and that's Bruce.