Do what you most enjoy. Cliche, yes, stupid, no.
In the long run, I don't think it matters too much what subject you do, as long as they're seen to be traditional academic subjects. In that sense, I think Geography is as interchangeable with English for dropping at AS.
Talk it over with your subject teachers, and get their opinion on how they think you will fare in A2 - it might help influence your decision to know roughly, how you will cope with the subjects.
Hope it all works out,