I currently have a Rotel RC-1070 pre and RB-1070 amp (130 w/ch). I am considering upgrading the amp to the RB-1080 (200 w/ch). At only 70 w/ch difference will I see much sonic improvement? Damping factor on RB-1070 is 500 and on the RB-1080 its 1000. I have been told bass extension will be better. My speakers are B&W 804N and sub is B&W ASW800. I was looking to upgrade the pre to the Rotel RC-1090 but it is no longer available in the US. I missed out on the recent RC-1090/RB-1090 sale here or we would not be having this conversation. BTW, I handed my RT-20p down to my son and he is so happy (now he can get rid of the Blose 301s and Infinity bookshelfs).