My 2 cents:
1. The only criteria for selecting a TV should be PQ as that is the primary function of a television.
2. There are numerous studies/reviews on internet which stress on the fact that difference in PQ depends on your viewing distance. But no study/review (for you) can be better judge than your eye.
Therefore, as you have also decided, auditioning a television set is your best bet.
Bottomline: Compare HD Ready with FUll HD, using True HD Content.
]
I have a different opinion on this. Audition with the content you primarily intend to see on your LCD. If television is primarily to be used for DTH viewing the TV with better PQ on SD/1080i feed is better for your needs if you intend to watch HD movies/Blue Rays TV with better PQ on HD feed suits your need.
Also you can keep following in mind:
1. Most display sets in show rooms are configured with High colour and contrast to give optimum PQ in show room like environment and therefore ask the shop keepe to change every television you audition to say "Cinema" mode as that is closer to how you will configure your television at your home.
2. As you are planning to buy a LCD/LED television do keep in mind the viewing angle. Audition your television from different viewing angles to make sure the PQ is consistent across the arc.
3. Play a channel/video with fast moving content to make sure you donot end up getting blurry images while watching your favourite sports channel (LCD TVs Get Faster Refresh Rates | PCWorld)
Finally just remember nothing is perfect in this world if there would have been a perfect television we all would have bought the same
. So buy the one which you find the best 
Cheers!!
1. The only criteria for selecting a TV should be PQ as that is the primary function of a television.
2. There are numerous studies/reviews on internet which stress on the fact that difference in PQ depends on your viewing distance. But no study/review (for you) can be better judge than your eye.
Therefore, as you have also decided, auditioning a television set is your best bet.
Bottomline: Compare HD Ready with FUll HD, using True HD Content.
]
I have a different opinion on this. Audition with the content you primarily intend to see on your LCD. If television is primarily to be used for DTH viewing the TV with better PQ on SD/1080i feed is better for your needs if you intend to watch HD movies/Blue Rays TV with better PQ on HD feed suits your need.
Also you can keep following in mind:
1. Most display sets in show rooms are configured with High colour and contrast to give optimum PQ in show room like environment and therefore ask the shop keepe to change every television you audition to say "Cinema" mode as that is closer to how you will configure your television at your home.
2. As you are planning to buy a LCD/LED television do keep in mind the viewing angle. Audition your television from different viewing angles to make sure the PQ is consistent across the arc.
3. Play a channel/video with fast moving content to make sure you donot end up getting blurry images while watching your favourite sports channel (LCD TVs Get Faster Refresh Rates | PCWorld)
Finally just remember nothing is perfect in this world if there would have been a perfect television we all would have bought the same
Cheers!!