Hey bro 1st of all dont place A things here
and abt leaving tata sky dont do so.
you must be attracted to more channels but dont worry tata sky will have them soon.The picture Quality of tata is better than that of DTH and sound Quality is nearby equal.
In my home (4 famillies ) there is only 1dth and 3tata sky.
Investing in DTH is wastage of money if u already have TATA SKY.
SO according to my experience dont invest in DTH now.
And remember abt a movies AXn was banned for this causse(Read in newspaper) .So as i think there will be none of them.