Just to give you guys a quick report back on the PS43D490...so far we are loving this TV!
We've watched some blurays and some dvds on it and they all look stunning! Colours look amazing and the black levels and contrast are excellent. We don't have DSTV yet (or any TV reception for that matter) so I can't comment on SD content, but HD looks great! I still need to throw some Planet Earth on to check for any judder issues though. And I haven't noticed any IR or screen burn-in so far (though we haven't used it too often)
It also looks great in our living room with the thinner bezel and I believe the TV is also physically thinner than the C series. This was something I was concerned about before buying (one of the reasons I was looking at rather getting a LED), but now that the thing is mounted on my wall, I don't know why I ever worried about it in the first place!
The only negative so far is that the TV doesn't support audio return channel, so I'll have to run another cable to get the tv channels' sound to the amp. this won't be an issue once we get DSTV though (will be routed through the amp).
One other minor thing is that when watching series off a memory stick plugged into the TV's USB port, the vertical stretch function doesn't work, so had to watch with black bars at the top and bottom. Not a major issue though. The stretch works on the other inputs though, so if you had a media player as a separate input, you would presumably be able to stretch the image.
To summarise - before we got the TV my wife said "why do we need an amp and speakers and everything? We can just use the TV's speakers". After watching one bluray on the TV she said "We need to get those speakers that go all around the room!!!"