This is another way of doing it (and indeed, is how I've got mine setup currently on my Sammy 7 series) if you don't have a decent enough surround system, but for £700 I'd be looking at something more high-end for better results.
agreed, i got my panasonic system along with the tv for 200 quid off the inflated ticket price. it does all i need, dvd, mp3, usb port etc etc. but for 700 quid its the proper doo dahs, as fiddy and ekona say, that your looking for