I have had a Phillips 9617 since early June and am delighted overall with both sound and vision. This set has a built-in DD 5.1 decoder and wireless rear L/R speakers come supplied with the set. Front L/R output is piped thru a high quality stereo setup into B&W speakers. A Gallo subwoofer is hooked into the pre-outs of the stereo amp. So the TV acts as a centre speaker and also drives the rears. DVD audio is piped into the TV decoder via a good quality digital co-ax. To me the home cinema experience sounds just great....but then this is my first experience of surround sound. Question is....will I see a significant improvement in surround sound quality by buying an AV amp, centre speaker and rear L/R. Has anyone with this set, or older Phillips set with same sound setup, done this and achieved a marked improvement ? If so, what kit did you buy or what kind of money did you spend to get the improvement ? I know I could get big improvements spending TAG, Lexicon or Meridian money, but can I achieve it spending Yamaha, Marantz or Denon money ? Any real experiences out there, rather than educated opinions ? Thanks.