As things stand at the moment, ACT is having the costliest prices compared to others in AP/TS. YOU Broadband seems to having competetive pricing with their 78Mbps unlimited plan. Obvioulsy Excitel is cheap but unreliable.
I got unlimited i.e. 3333 GB plan in Bangalore Airtel broadband while checking my balance data today,called customer care they told it is being offered to few customers who are on 40 Mbps speed Rs799 100 GB data plan