I need some help on what to do.I have a Yamaha rxv496 w/energy take5's in my kids tv room which my brother would like to buy.I originally told him no until i saw at tweeter a Denon avr1804 w/Mirage nanosat system marked down to 699.00.Now i'm thinking would the denon/mirage combo be an upgrade to what i presently have in the kids room.Would this combo be a good upgrade if not i wont touch it.Any and all opinions on what to do would be greatly appreciated since its unk how long the denon/mirage combo will be available.thanks