If you compare the the 3060 to the 3080, the differences are as follows:
3080 - ESS SABRE PRO Premier DAC™ES9026PRO (for main 7 channels) , 3060 - ESS SABRE32™Ultra DAC (for main 7 channels)
The 3080 also gets surround AI, the ability to hookup wireless surround speakers with MusicCast, and balanced inputs. No other real differences.
I paid 2k for my 3060. If I had the chance to get a two year old flagship receiver for less then a grand, I'd jump all over it. So my vote would be for the 3060.