OP,
My Aurender W20SE is $22K. I was concerned about the cost until I put it in my system…. It is a bargain. I immediately was thankful that I didn’t go for a lessor model.
Your thinking is in the right place… battery is quiet. The Aurender uses a battery to power the audio portion to minimize noise… it works. MACs / PCs too noisy. A good streamer is built up from the ground floor to be quiet.