You can go for Insat 2E,3B you will get more than 10 Tamil Channels. Following are few among them.

Kalaingar TV
Isai Aruvi
Raj News
Raj Musix
Vasanth TV
Win TV
Mega TV
Tamilan TV
Makkal TV
Angel TV
Jeyam TV
Aseervatham TV

and loads of Malayalam Channels.

Visit www.lyngsat.com/in83.html to get the complete list