Thanks guys for all the opinions and information. My speakers have about 6 hours on them now so i re ran my YPAO with very good results plus did a few other tweaks on the my receiver which helped out even more. I adjusted the Volume trim and Subwoofer trim up to +3 from 0 ( default ) which really help out the mid bass and Dynamic's that i thought may have been a little weak because of the amp in the receiver. There is so many adjustments on these new AVR receivers that it sometimes takes weeks to get everything figure out. I am now seeing upwards of 89 db at the listening position with the receiver volume at -17. I still agree that a separate amp would be a good thing and help on those microsecond burst in dynamic's and help protect the speakers from damage. That was my thinking in the first place. Stronger amp with all channel driven, less volume needed, less distortion, cleaner sound, more reserve power for those microsecond peaks and dynamics, help save the speakers. The XPA 5 is to big to fit on my shelf plus more money then i wanted to spend. I was hoping that the UPA-500 with do some improvement but after seeing some of your thoughts it probably wouldn't be worth the extra expense. But with there return policy i might still try it just to see. I still think it would look cool sitting there on the shelf above the receiver. I was just hoping it would improve on the sound as well!
Living room; Samsung PN60F5300B Plasma TV, Marantz SR5008, Oppo BDP-103, Definitive Mytho 2's fronts, Definitive Pro Center 1000, Definitive Di 5.5R in ceilings, SVS SB-1000 subwoofer, Comcast DVR HD box.
Garage; Sherwood RX-4105 2 channel stereo receiver, Samsung DVD-C500 CD player, Klipsch KG 2.5 med Oak speakers