I'd personally avoid Sony. I've owned three in the past couple of years and they have all developed loose connections at the back. Two were on the speaker connections and one on the video connection. When I took the last one to be repaired the guy said it was quite common because the solder joints tend not to be very strong on some connections.

I suppose it depends how much you want to spend really. I'm not sure what brand I'll go for next, but I'll probably pick up a Home Cinema magazine and have a look through the reviews.

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Oliver