I currently have a Creative inspire 5700 5.1 AV system which comprises a basic receiver/applifier and speakers. It has suited my needs up till now. I am now considering changing to a seperate system ie seperate speakers and a receiver. My first question is do i need a receiver and an amplifier or are these one and the same. Secondly will any set of speakers fit any make of model. ie will a yahama receiver be compatible with sony tannoy speakers. I also need advice on what receiver to buy. At present i am considering the Marantz 5400 which i have found for £299, i have also found the Marantz 4400 for £199. Does the extra £100 but you a lot more . I also fancy the yamaha RX range ie the RX650 is currently £269 in my local Richer Sounds. Is this a good buy , how good is that system. I have also seen the Sony STRDB795 for £222. Is this any good or is the Yamaha better. What about the yahama RX450 (£190). Is this a better choice over the Sony. What i am looking for realy is the best system for about £250 to £300. I also see that Yahama do package deals ie including the RX350 receiver and the RXSl80. Would even these packages sound better than my existing model. I want to be able to hear a difference when i upgrade. In relation to speakers what would be the best speakers to buy to complement a receiver. I notice that the Tannoy FX5.1 (which got top marks ) are currently £150 on the net (They were retailing at £450 at the end of 2003). Any advice woould be appreciated.