Some advice please .....

I'm thinking of buying a rear proj television but don't know which to get .... the ones I'm considering are :

Sony KP44PS2
Sony KP44PX2U
Toshiba 42WT29B
Panasonic TP42PT12
Samsung SP42W5HPX

I know the Sony PS2 is an old model, but it's included cos you can wire it up to be the centre speaker in the surround sound setup.
Can you do this with any of the others? Which would you say is the best overall? Do any of them have any major problems. i.e. I should steer well clear of them?

I'm keen to hear about the Panasonic as I've not seen it reviewed anywhere yet .... also I'd prefer to stick with Sony cos my current TV is a Sony and it's been nothing short of superb ...

Thanks