So finally I took the plunge and bought the "terminator of the TVs" (as adder put it) - the Sony KLV-40z450a this Diwali. And till now, I am thoroughly satisfied with my purchase! Touch wood.
Interestingly, the Sony World I bought it from was having Sony India people visiting that day, so I got to meet a few of the Sony Sales/Marketing people as well. I paid about 105K for the TV btw.
To those waiting for KLV-40z550 (Thetas, GeoTracks?), couple of things you may want to check:
Congratulations!! It is indeed a super buy!! Do post pics.
Just to clarify, I only had the SONY 40" V (70K) & W (90K) 550 series in my radar. The SONY 40V550 was the more likely candidate b'cos, paying 20K more for 100 Hz was something challenging for me to justify, no matter how hard I tried.
Anyways, finally purchased the SAMSUNG 40" 5 series, b'cos I got a really good festive season offer, almost 25K lesser than the 40V550.