Relax
I drove a 7.1 all Polk tower set-up with a Denon 3805 (120 watts per channel, but less with all channels driven) with absolutely NO clipping, overheating or strain. I had two RTi12's up front, a CSi-5 center, two Rti10's on the side and two RTi8's in the rear. The 3805 never broke a sweat and I listen to music loud. If your Oink starts whining get an outboard amp (lots if deals on Audiogon) to drive your fronts. BTW, in my opinion the RTi8's have a more balanced frequency range than the Rti10's. The 10's seem bottom heavy at the expense of the mid range. I'd go with 4 RTi8's to compliment my RTi12's in I had it to do over again. I now have Def Tech speakers, which to my ears deliver more dynamic detail in the mid to upper ranges than the Polks. But the RTi12's, with proper placement and room treatment, can squeeze all the nuance and detail the music has in it to give. Please let me know how well this has worked for you so far.