DAC. My system doubles as my 2ch. system. Sound quality above all else. That being said.
I prefer a basic 5.x setup for home theatre. So I personally am not looking for more channels.
Up to date formats without paying for the newest thing that may not last. Atmos? Well, we'll see. Remember BETA?
Biggest, strongest amp section I can afford.
Ease of use. Well laid out, easy remote.
Overall look of the unit. Has to fit the décor.
Streaming is cool, but everything else, from your display to your Blu-Ray can stream these days. Sort of redundant.
Multi zone. Do you need it?
Last, but not least. Quality. It has to be trouble free, work every time, no excuses. Why should I expect less when spending hard earned money.