guys... here is the catch.. the STB provided with Airtel normal DTH does not have a component out, which means that you will not get a good picture clarity for LCD's. Where as Reliance, Sun DTH and tata sky does have the component output.. and i guess thats where the price difference comes in.
Ppl choose Airtel cos of less initial investment and good customer service and meets the purpose of watching TV (CRT), if you really want a good picture quality for LCD you obviously got to go for STB with component output...
Secondly the HD STB's are not 1080P output rather its 1080i... Again there is a difference between the two. 1080P has the best picture clarity and none of the channels telecast in 1080P.
Its all your call.. i would vote of Tatasky and Airtel.
Reliance, Sun DTH sucks.. you really dont have any customer support in there...