penn,
This thread has gotten way more confusing than it needs to be.
There are two routes you can take:
1) Pro active monitors as recommended by TheWarrior (and the AudioEngines are very good). The biggest advantage is you can take the money you would spend on a receiver and put it into the speakers! For connections, you can feed the promonitors from the TV just as you would a SoundBar and use the TV to select your input as Robert suggested.
2) Passive speakers as recommended by BSA (who agreed with TheWarrior, but kind of didn't, at the same time). The biggest advantage of an AVR with passive speakers is flexibility to add a subwoofer and grow your system into a full HT system.
Since this is for your living room (as opposed to office/desktop), I would be inclined to go with option 2. The Philharmonic Affordable Accuracy (AA) Monitors will get you more bass in a large room than any pro monitors I know of and I think you will be thrilled with their clarity!
I applaud you for not worrying about surround. So many people stretch their money too thin buying 5 or 7 speakers such that they never get good sound quality!
I know you are thinking just stereo speakers for now and the AA Monitors have prodigious bass, but if you are a fan of action movies, you may consider adding a subwoofer down the road...just for the fun of it! It will change your at-home movie night experience!
Of the receievers you listed, I would cross off the Sony. Their low-end receivers have never impressed me very much and I feel Pioneer offers better value. I am unfamiliar with the Pioneers, and they may be equal or better, but because of my past dealings with Accesssories4less refurbished AVR's, they are my "go to" for AVR's (and I should note that refurbishing is done and warrantied by the manufacturer, not some third party trying to milk every dollar out of a bunch of returned goods they bought).
However, I would recommend this:
http://www.accessories4less.com/make-a-store/item/yamhtr3067bl/yamaha-htr-3067-5.1-channel-av-receiver-like-rx-v377/1.html
If you would like bluetooth (so you can stream from your phone, tablet, etc):
http://www.accessories4less.com/make-a-store/item/denavrs510bt/denon-avr-s510bt-5.2-full-4k-ultra-hd-a/v-receiver-w/bluetooth/1.html
If you like Yamaha and want bluetooth, get this one (but I am not sure it has a BT remote control app like the Denon, however the warranty is extended to two years)
http://www.accessories4less.com/make-a-store/item/yamrxv379bl/yamaha-rx-v379-5.1-home-theater-receiver-bluetooth/1.html
So, I would say, get the AA Monitors for roughly $225 (after shipping), the Denon for $190 shipped at a total cost of $415. I have the AudioEngine A5's and for a large room they will not compete with this system!
I would encourage you to consider something like this for future:
http://www.parts-express.com/dayton-audio-sub-1200-12-120-watt-powered-subwoofer--300-629
PS - some of your links for receivers were to ebay and Amazon. Make sure the seller is an authorized seller for that product. If not, the normal manufacturer's warranty is not valid.