You already said in your other thread that your primary use is movies, not music, correct? The main difference between the 60's and 80's is that the 80's will drive to more insane volumes I have the Denon 2805, and have driven my 60's to volumes that make me very happy. I grew up around 70's and 80's (metal) music so I like it loud sometimes.
I guess I find the 80's may be overkill, for what your purposes are, maybe you have no bottom to your wallet