HiFiShark is a great resource for shopping for used equipment. Personally in my opinion, I think you'd be better off with buying used speakers and new electronics. Do you listen to records? If not the BlueSound POWERNODE is an excellent choice for an amplifier. Its a small box that has HDMI input for your TV's HT. Its a streamer/amplifier with interface that you install on a tablet. I'm guessing your wife would approve of its form factor.
Do you have pets? My significant other has cats I bought her used Canton speakers that have a metal grills and the POWERNODE. Those speakers are pet proof.
However these speakers would not be your best choice for HT.