What goes best with ca ? cs, cwa of llb ?

I have completed my B.Com. and presently in CA Final. I have passed group I and appearing for Group II. I'm interested in Practicing after becoming CA.
I'm confused as to what should I study further, after becoming CA. Whether I should go for CS, CWA or LLB ?
Please guide me, as which qualification can help me if I want to Practise in the areas of Income Tax, Service Tax & VAT. Please also explain me as to why, you suggested a particular course.
Also guide me if any exemption is available in internship or exams in under CS or CWA, after I become CA ?
Is it permited to continue Practice as a CA even when I continue my internship under CWA/CS ? Can I undertake Tax Audit/Statutory Audit/Concurrent Audit work along with internship of CS/CWA ?