Hi to all denon owners! i own denon x6400h and wondering whats the big deal about the new line that coming out now x6500h ,i've heard i-max sound and other minor changes where i really dont see the reason to spend 700$ more then 6400 model! unless 2 fans for cooling is one of the reason ?i'm still thinking to switch it to 6500 model because i bought mine around 45 days ago for 1950$ and abt elektronics wants to be nice and switch it for me when they get shipped for 250 extra to get the new model ,only if is worth it upgrading???