I have an airtel dth connection since many years but for the second tv I took tata sky as its really gives great picture quality.
Best in class with 100% signal strength and great sound quality specially for the HD users.
Highly recommended to all users going in for dish connections as these are the pros I found using them for an year now:
Best signal which means great sound& picture. Prompt customer service guys who are quite polite. Flexible plans to choose from making it quite easy. Relocation too is attended on prompt basis. In one line to sum it all up "Tata da jawab nahi"!