After a very quick check on the models you listed the Pioneer seems to have Standby pass-through. I didn't see it for the Yamaha. The Pioneer 523 has the standard version of MCACC which has a 5 band EQ and only one manual preset (the advanced version has 9 bands and 6 presets). I don't know much about the Yamaha 375 but it wouldn't surprise me if it's YPAO is a bit better then the the 523's MCACC.
The refurbished Denon 1513 for $122 is pretty good but it doesn't have any room EQ. The Denon 1613 and E-300 for around $230 both have Audyssey MultEQ. My brother has the 1610 and it's a very nice budget receiver but I never cared for the setup and operation. To confusing.
All of these receivers are cutting corners to help keep the cost down.
In looking at these receivers, I'd look for a good used model from 4-3 years ago. Something like a Denon 1910/2110, Yamaha 667 or Pioneer 1018/Elite 03 or 23. You should be able to find them for around the same price as the models you listed. No warranty of course, but much better core performance. VBut I realize used isn't for everyone.
I have a an Elite VSX-23. Excellent avr. I'm replacing it with a SC-25 I got a real good ebay deal on.
"Everyday room": Panasonic 58" Plasma, Dish HD DVR, Pioneer Elite vsx-23, BDP-23 BR, dv58avi universal dvd player, Paradigm Studio 20 V1, CC-450, Dayton HSU-10 subwoofer.
"Movie/Music room": Toshiba 65" DLP, Dish HD receiver, Marantz 7005, CC-4003, BD-7006, Polk LSI25's-LSi7's-LSiC, 2 original Dayton 10" "Mighty-Mites" subwoofers. (subject to change without notice).
Also have MB Quart Vera VS05 +.....too much to list. Help me.