Help with integrated amp choice


New to the site and admittedly proabably not at the level of sophistication of most on here but here goes.
Attempting replace my Denon 750 for around 2k driving a pair of Polk 10s 
Have had hooked up the NAD 368 and now the Nova 300.
First question with no input and the amp maxed out should there be any noise (hum/buzz)
Second it may be just my bad audio memory but the  Denon just seemed to be more accurate.
Now I know that may sound like heresy to some but is it my ears or my expectations?
Using California labs CD for the testing
I’m lost  just trying to listening to 60 - 70rock
Would appreciate any help and direction
Thanks 
Jim
jwfitzdo
Gotta give a big shout out for either the Hegel h160 or h300.
Both can be had at bargain prices right now, both have competent DAC built in
The h300 boasts 250wpc, the h160 has 150wpc, both into 8 ohms.
Both are very dynamic punchy amps with great control over vast majority of speakers.
And the prices these can be had for right now is just obscene...lol.

Parasound Halo also a very stout piece and excellent all rounder.
Buy a PrimaLuna Dialogue integrated on Agon. You’ll be blown away. They rarely come up and you have to buy immediately when you find one. They’re that good. 
Not to be too mercenary, but I just listed my nearly new Peachtree Nova 300. It’s a great choice for you and extremely flexible. When I bought mine, i considered the parasound, the prima luna, or a Micromega. Came down to the peachtree the Micromega. Peachtree won out because it’s sound had a bit more “meat on the bone.”  There are lots of choices in the all in one market now. Most are pretty good. (Also, the Moon Neo Ace is pretty outstanding - I’ve heard it and it’s sweet and detailed vice the “meatier” bigger sound of the Peachtree - matter of taste). Good luck with your search.