My First Question to you would be:
Is Size your concern? Like 55" and 52"?
If yes then the only options you would have are:
1.Samsung 55B650 250,000
2.Sony 52V550 218,000
BTW Sony Bravia 46W400 is not available its been replaced by Sony Bravia 46W550A. PKR179,000.
If you want to get an LCD for a bed room or lounge then Sony 40S550A (PKR 82,000) Would also sufficiently do the job. Its Full HD with nearly all options, it only doesn't have internet capabilities(which aren't a Big deal!).
According to surveys i conducted while searching for an LCD:
1.Sony are malaysian but Samsung are Local assembled( Imported have no waranty)
2.Samsung have internet capabilties but Sony doesn't.
3.Sony have a more "natural colour" then Samsung.
4.Samsuny usually but not always have higher Contrast ratio.
Hope this helps you!
p.s. if you want to get 50"+ go for Sony(V-series). If you want 46"(6-series) go for samsung(due to price less then Sony, but remember that 46W is also very very good even at pkr.179,000) but if you want a 40" go for Sony 40S550A(PKR 82,000)