Thanks! I'm willing to spend a little more money to get better quality. What's the next step up from an S9xx device that meets my needs?
The problem is not how much money you can spend, there isn't fully perfect device available right now. the most expensive device for LE is intel NUC which has its own problem like drivers, audio passthrough, Dp to hdmi converter, HDR support, wake up and suspend and so on. another option is to buy ARM devices, for now only Amlogic's S9xx devices is worth buying. S9xx family included S905x which doesn't have Gigabit Ethernet, S905D which has Gigabit Ethernet and DVB interface and more powerful S912 devices which doesn't have proper GPU driver as i mentioned above and you should avoid it. you have army of best of best tv boxes in your arsenal like apple tv 4k and odroid c2 the only thing i can recommend to you is MECOOL KI PRO but i'm not sure that it can support dolby atmos passthrough.