I just scrolled through the thread, but I figured being that I do professional audio work as a secondary job (recording and mastering records mostly), I'd chime in
Personally, Pioneer is my go-to brand for AVR's, without a doubt! The SC-1222K is an absolute steal right now, being identical inside to the Elite SC-63/65 units, the only difference being that the 1222 doesn't have the pair of 12V triggers... Seeing as you are getting basically a $1500 receiver for $500 or less, one that is cleaner sounding, more versatile, and better built than ANY Onkyo, Denon, or even Yamaha anywhere near that price...it's something I just can't NOT recommend!
As for speakers, well, owning and enjoying everything from my countless vintage sets (currently listening to RTR Digital V Model20's) to "fun" speakers like Cerwin Vega VE-12's to "serious" speakers like the full surround set of Sonus Faber Cremona's I've got...and not counting the closet of headphones...I'd like to think that I'm pretty well up to speed on the subtle (and not so subtle) differences from one to the next. Then again, the reason I get paid is because of that, so chicken or egg?
Anyway, you won't believe me until you go into a store and hear them for yourself, but I'm going to save you HUNDREDS of dollars here and tell you:
STAY AWAY FROM THE JUNK POLK/KLIPSCH MASS MARKET STUFF!!! They're barely a step above Bose anymore, honestly.
For home theater and music on a pseudo-budget, I recommend and stand behind 100% the Pioneer by Andrew Jones series of speakers, and you can get a full 11.2ch setup for less than a 5.1ch setup of mediocre Polk's.
Andrew Jones is basically the god of speaker design, and he really did design these from the ground up; and so while they don't look like much, he was given a certain price he couldn't exceed, and rather than fancy wood finishes, it ALL went towards the actual components and especially the extremely elegantly designed crossover units that look more at home in a $1500 unit than a $150/pair set!
Yeah, that's right.... $150 a pair for the FS-51 towers (FS-52 is available now), and so far I've converted 6 different friends to them from their Bose/Polk/Klipsch setups...
One of the great things about 4-way towers that sound 10x as expensive as they are (and are only 3.5' tall)? YOU DON'T HAVE TO SACRIFICE BY USING BOOKSHELF SPEAKERS ANYWHERE!!!!
Surround sound is inherently a compromise in a home setting, unless you have true full-range speakers in every position (don't even get me started on the stupidity behind horizontal WTW design "center channel" speakers!).
Add a pair of 10-12" powered subwoofers (really, 10" is the most you need unless it's a huge room), and for $150/pair x4 + $100/pair x2 ([censored]-42 3-way bookshelves for FH/FW) + $100 x2 (subs) + $500 (SC-1222K), you have 8 FULL RANGE towers superior to any of the Polk you have been looking at, another 4 LARGE 3-way bookshelves, a pair of 10/12" voice-matched subwoofers, and an extremely powerful Class D3 amped Receiver!
Without going used, I've yet to find a single setup that comes anywhere close, and remember, I am eating crow myself saying this sitting here with quite a few $4-8k/pair speakers by me.... :S
So, if anyone can do full 7.1ch surround USING 4-WAY TOWERS for all mains PLUS four 3-way bookshelves for FH/FW speakers PLUS dual subwoofers...PLUS a top-of-the-line home receiver using a C3d amplifier...and do it for anywhere near $1500 (11.2ch) without any compromises in quality, you'll be the first to show me a truly superior alternative.... I just don't think it can be done.