I am definitely doing: Maths Physics Economics But I don't know wether to do geography or further maths, what looks better for uni?
It is not a question of what looks better. It is a question of what you want to study at university and which A-levels give you the best preparation for such study and the most competitive application.
For instance, if you wish to study maths, actuarial science, economics, physical sciences or engineering you would be better off taking further maths. If you wish to study geography then you'd be better to take geography.