pl. suggest

Naroo,

The highest  carrer  in taxation is C.A, it is undisputed,because incometax has given 44AB audit signing 

authority to  QUALIFIED CHARTED ACCOUNTANTS,only so you go for C.A course,along withC.A,

ICWA & CS  are also good courses they also give equal importance for the study of taxation matters ,icwa and cs are good for service purpose but ca is for those who want to practise ,but now days to be successful accountant the indepth knowledge of taxation,company law knowledge is necessary,when you  study little things you only land in as a accountant, if you go indepth you will land in as a CHARTERED ACCOUNTANT.

Pursing  Chartered Accountants course is the Best way to build you carrer in Taxation.

All the Best.

Yes, pusuing CA is the best option.