I always wanted to ad an XPA-5 or XPA-3 to the Denon 889 i had, but it didnt have pre-outs so that was not an option. But now that i have pre-outs you better believe im gonna add some more power down the line!
The dealer i got it from was actually leaning towards the Denon A100 or 4311 for me. They would have made more money had i gone with the Denon over the Yamaha. Plus i saw all the wiring at the back of the recievers because i was messing with the REL sub they had next to them. No gimicks at this place, they're cool guys.
As far as the amps being better on one over the other its hard to believe. The Denon A100 i think is rated at 10 more watts per channel & costs $1000 more. I assume that the amps between that & the Yamaha RX-A2000 would be considered pretty equal if not leaning toward the Denon.
I know most dont like to say the words "bright" or "warm" however that is the best way for me to describe what i heard. From my experience those terms still apply to AVRs. They each have a signature sound. Ears dont lie & all i know is the Yamaha made my system more detailed & dynamic. Its just a better reciever than my previous one!