a. Power Amp - rotel RMB-1075 b. Processor - rotel rsp 1066/1068 or better c. New Surround Receiver - yahama 2400 /2500 d. Integrated Stereo Amp.- arcam or roksan The main issue is to improve the overall sound quality both multi channel and stereo. I like the sound of my old yahama in 5.1 but the pioneer is very good in stereo but not so lively in 5.1 or 7.1. I take it that improving the dsp processing will improve the overall sound much more than improving the amplication. £800-£1000 to spend.