I have a denon 3802 and am generally happy with it. However lately I have been feeling the need for more power.The Denon is driving a 7.1 setup - B&W 602 S3's as fronts, B&W CDM NT SE as the centre, B&W LM1's as surrounds and a pair of kef eggs as rear surronds. The sub is a REL Q100E. Now the thing is that I don't want to spend too much on an amp,and want to keep the 7.1 system,and also want to keep all the equipement I have. What is the cheapest option in getting more power from this system. Can I buy a 5.1 poweramp and add the amplification of the Denon as well? What is the cheapest way to go about it?