The Rotel is miles better than the Pioneer. The Pioneer will also become miles better on any remaining channels by using the Rotel for front L&R. Nice upgrade.
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The ONLY hangup with the RB-1070 is no factory 4ohm rating.
8ohm, sure and 'bridged' also, but no 4ohm rating.
It is 130x2@8 and (can't recall) 330 or 360 bridged/mono.
That being said, unless the Polks are really awful loads, you should be OK. The Rotel drove my Magnepan MG-1.6s quite well, except when going for sheer loudness and never ran too warm... The Maggies, while being 'current hogs' also are not a bad load, NEVER going below 4ohms and with moderate phase angles.
The RB-1080 is 200x2@8 and HAS factory 4ohm rating.
Maybe it is worth the extra (aprox)40% new?
2 further points.
What is the mininum impedence of the Polks?
Do you want to take a chance on having to do this twice?
I recently upgraded from the Rotel spearates to the Pioneer Elite receiver. I don't use it for music, just movies. In my system, to my ears, the Elite was just as good, and, perhaps, a bit more detailed, and a tad quieter. I would agree that the Rotel set up was warmer. The soundstage was a little wider but the Elite is definately more transparent. I am considering hooking up the Rotel 6 channel apm to the Elite pre-outs to see what it does, but not in a hurry as I'm pretty happy with it. The new audio codecs are simply amazing, which the Rotel gear, obviously, doesn't do. I think it's the RMB 1068 pre/pro.
I would want an amp rated at least 175-200 watts/ 8 ohm...long term satisfaction is very important IMO. Adding a dedicated amp to the receivers pre outs, takes a lot of the load off of the receivers power supply....this can only be a good thing.
This route also gives you the option of adding a higher quality two channel preamp (hometheater pass-through)... at some point down the road.
I agree with BOB Reynolds...all the budget solid state amps sound "pretty much" the same, as a matter of fact....they sound like their power supply (and more supply is better).
I'm really considering the Odyssey Khartago stereo amp. It has the following:
Right price, accepts 4 ohms, high quality, 30 day money back, AND 100% credit for trade-ups. Oh by the way, a 20 year warranty (transferrable to one owner).
At 130 watts X2 (8 ohm), it would be perfect for my current situation. When I move out of the condo, I can upgrade or even power surrounds if I didn't trade in. I think I will try one out