Killer used integrated for

Setting up a basement system and looking to replace older Marantz surround receiver with something more for 2 channel for under $500. Was looking for a Audio Refinement Complete but none for sale. Any others I should be considering? No phono needed.

Creek Evolution 100A 

Cyrus 6vs 

Exposure 3010S2D

A killer integrated for under $500 is a tough ask IMHO.  There’s a NuPrime IDA-8 on US AudioMart for $700 that’d be great if you have an extra 200 bucks to spare.  Best of luck. 
Musical Fidelity M2si