I would suggest to go for TataSky.
I was once a loyal customer of Airtel Broadband for almost 4 years. Their good plans vanished day by day, fair usage policy on almost all plans came to existence, customer service become worst. Then I moved to BSNL. Airtel Mobile also has similar problems. I expect the same kind of treatment for the DTH customer too in future.
Be wise.
Regards,
Raghavan