Oh it wouldn't be a waste that's for sure. You would be getting 200 for sure or 400 depending on the amp your thinking of. Your avr is only getting I think in the neighborhood of 65 for real on all channels as opposed to what they say it is. ATI or Emotiva, Classe, Parasound all are real watts LOL. And as said by peek it has made a BIG noise on his stuff. GOD 400 watts Id get that just to freak out the 1st time I turned it on LOL.. Id be AFRAID to turn it up any.. Let me put it this way I saw a rep from B&W last night with the 805 Maseratis little bookshelves that cost 10k... anyway he had them connected to a 300w per channel Classe amp and had them cranked to -20 to -15 and they were BEAUTIFUL sounding and he said hes had them connected to a 1200w per channel amp before and they were amazing!!!
Just to give you an idea.. Well I'm not going to get either till this spring anyways, I'm just trying to figure it out like you I guess. More and more I'm liking the XPR5 this week anyways LOL.
LG 55LW5600 / Roku3 / Logitech 520
Sony BDP-S570 Blu-Ray, Toshiba HD-D3KU HD-DVD
Bowers & Wilkins 683B (mains), HTM61 (center)
Polk F/XiA4 (Surrounds), Paradigm Titan v3 (Back Surrounds)
HSU VTF-3 MK5 HP