ok here is the deal, how much power do you really need for tower speakers, the speaker manufacturers say they take 150-200 watts depending on the speakers. now I am planning to upgrade my bookshelf (80w) speakers to towers all around (150-200w) I currently have a Yamaha RX-V1300. So i figure a good power amp will be necessary. My local dealer carried NAD and Rotel, but they both seem to top out at 5 channels, and im running a 6.1 system so what do i do? how much power do i really need?