See, this is primarily dependent on you. VIT, SRM, Manipal, Amrita, Sastra all offer CS and packages are good. However merely getting into a university or college is not enough. There is no guarantee that the highest package will be offered in the university that you get into. It will depend upon your performance in the interview, your CGPA and such factors as well as the company. As per placement trends all these Universities offer good placements.