Do you have a separate two channel amp/preamp or are you wanting this AVR to be the whole system?
Regarding new TVs, it will vary slightly via manufacturer. My Vizio TV has analog and toslink output. I can play the Roku through the TV and pass the signal digitally to the AVR as 2 channel PCM. So if your TV has enough HDMI inputs for you, you could run HDMI to the TV from your sources, and run Toslink to any DAC or stereo digital preamp. If you have a Bluray player and want better sound just connect the digital out to a DAC. Going to only 2 channel simplifies things.