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 CA 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 Legal work/department along with the secretarial work/department. Later on you may be designated as legal and secretarial head.
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.