As per my suggestion with CA you should go for CS to grab top opportunities at management level. CS is a very good combination with CS as far as course content and understanding the corporate environment is concerned.
If you are having CS qualification then it would be counted as an additional advantage and you can easily and confidently handle or administer secretarial work/department along with the account work/department.
This advice is based on my professional experience. Hope this would be off some help. Other courses are also good. But my vote goes for CS as according to me CS qualification is the gate pass for top management position.