I've seen a bit of a bargain on a shop demo Harmon Kardon AVR260. Is this receiver any good? I'm putting together a system for the first time and don't know much about the whole thing. I realise that this is a slightly older piece of kit now, and so will be lacking some of the features of more modern amps, but as far as I can tell there's nothing missing that I particularly need... I'm really more concerned about sound quality. Any advice?