I have both the Parasound 1500a and the Rotel 991 which is the predecessor to the 1080. In the store I auditioned both of these amps on Monitors and liked the Rotel better but when I brought them home and put them on my NHTs, the Parsound went on the mains and the rotel on the subs. That being said, I thought the rotel was a little more laid back on the Monitors and I am not a fan of a bright sound. But the Parasound was more transparent on my NHTs. Both are good amps and I would suggest trying an in home demo if at all possible and keep the one you want. After all, they have to sound good to you in your system. Good luck.
-Kevin
-Kevin