Eh, nothing to be ashamed of
I'm not coming from anything better and I'm practicing what I preach right now. I'm updating my front towers, just got a new receiver, an amp here an amp there, and I'm about half way there. Next step is to (hopefully) build a sub this summer.
Any of the mentioned receivers will handle whatever you're looking to do just fine, unless you want 3D. Then you'll need something a bit more updated.
I'd read that the YPAO is adequate but that the audessey is a bit better, especially the newest version of it. I've also read that the ARC system offered in the anthem receivers is just as good as the audessey, but gives more customization options and has more detail.
It seems to me like the Marantz 5006 will be exactly what you need, again I have one so I'm very familiar with it, but any of the choices above would do.
The real deal is and will always be the speakers
and maybe the amps, but thats a debate for another day.