I have Energy's and they sound crisp...or bright/harsh in the highs, just seems to depend on the source and material. I have run them with an older AVr120 HK, Denon and now with the Denon/NAD combo. They really shine right now with the extra power.
I have heard that almost exact Polk/HK setup at Future shop and I was impressd! Best I have ever heard at FS, but that's not saying much. As always only your ears can judge.