What Grador said. I also find entry Polks of the past to be really awful. I think Onkyo HTIB speakers are superior.
Almost everyone (like 19/20 people? 99/100?) thinks those Pioneers are extraordinary values. Haven't heard them either.
I'm one of those who would probably go with Denon/Onkyo, but that's because I want Audyssey; in a 2ch situation I wouldn't care nearly as much to have the tech. Yamaha has good reliability, and the link seems to be a very good value as it's superceded. I for one don't think you should go up with receiver budget, unless you're sure you got the best speakers you can for the money, because that's where it's all going to matter. I'm just "feeling" that this system is for a small room, office, nearfield, moderate listening, something like that. It's all about the speakers. Getting the electrical signal through is relatively easy all the way up to where the wire ends at the speaker terminals. From there however, this is where the greatest compromise in a purchased audio component come from, not even close: getting the electrical now into mechanical energy that your auditory senses will pick apart is a complex and compromised thing.