Hi, I am seriously considering purchasing a Yamaha RX-V657 7.1 decoder, however I have seen the RX-V650 decoder for up to £70 cheaper and cannot tell a difference! Also, would the NS-M515 speakers be suitable for use with this amplifier as front AND rear speakers? The output of the amplifier is 95w/channel and the speakers are shown as a nominal input of 60w however with a maximum input of 200w. Will the amplifier damage the speakers at high volumes? What about if I only wish to use the system for 5.1 sound output? It does not necessarily have to be this amplifier, just a yamaha one with similar sort of power, and the YPAO technology. I'm only 17 but i do know a good sound from bad, any help would be greatly appreciated. Thanks, Rodgeonbike.