Moving up from an Oppo 205

Why are you upgrading? Are u satisfied with your oppo? If you are not, what are u looking for in the new device?
upgrading an Oppo is a hard thing to do.  But you can still use it as a CD player, blu ray player, 4 k player and use a DAC after the Oppo using it’s bitstream feature.
i love NAD and Classe.
i would go with a M32 as a 2 ch integrated amp, that has all the streaming capabilities or with the classe sigma 2200, but u will loose some streaming capabilities.

@vdosc. I’ve had the exact same setup as you. Aurender N100H, Oppo-205 and c2500. I upgraded the DAC to the Bryston BDA-3 and it had a significant improvement. My N100H and Oppo-205 are both connected to it. 

Yes I would agree, I have experienced noticeable improvement with cables. Current a Shunyata Venom USB cable which was an upgrade from a previous Audioquest wich was an upgrade from a basic USB cable.  Also I have realized noticeable improvements with power cable upgrades.  I have all Shunyata  Alpha NR and Sigma NR on everything.  Ironically my power cable on my Oppo cost more than the Oppo cost when bought new!  But I was not a subtle improvement !

Adameos. What DAC is your 205 feeding? I have a 105D and am considering a similar move.