<font color='#000000'>So, what is the difference between 80 watts and 170 watts? If you don't plan on cranking it up till your ears bleed, what is the big deal? I currently own a Yamaha DSP-3090 that I bought in Japan back in 1998 or 1999, and that sounds great. The only reason I want to upgrade is because my receiver doesn't have DTS. But alot has changed since 1999. I don't want to have to upgrade my receiver for many, many years. Or maybe never. This is a one time buy (money is not an issue). I have Klipsh KLF-20 front speakers, booze 301 for front effect, A ten inch Yamaha sub, Yamaha rear and center speakers. I just want the top-of-the-line receiver for this time in age. It is a toss up between the Denon 5803 and Yamaha RX-Z9. But on to the original question. Sure, I like to jam it every now and then, when the wife and kids aren't home, but 170 watts sounds how different than 80 watts at a pleasurable listening level?</font>