I've got an Onkyo TX-SR507 AV amp and Jamo A102 HCS6 speaker system, you can get the whole set up for £500-£550ish. I've had them about three years now and in an average size lounge they perform pretty well for the price but you may want more HDMI and optical inputs. I run my sky box, Sony Bravia TV, Xbox, blue ray player, a CD player, DAB radio and my home network through it and I have a couple of free slots but I have to use a mixture of inputs to get it all to work.