Decided to change my cd player, suggestions please?

Ok so I guess this is as much a change just for the sake of change, lol, as tbh I am pretty happy with my setup but it has been the same equipment for the last 3 years so just what the heck, lets fiddle.....

So present equipment is:
Krell KAV250A
Acoustic Research LS2
Krell s-350
Usher cp-6381

Now i listen nearly exclusively to rock, mostly modern rock like Avenged sevenfold, stained, shinedown, saving abel, halestorm etc etc. Some more classic rock if I am feeling mellow.
I do not believe anything much else will ever grace my systems

I fully realize I may take a step backward or two but if there are far more expensive players out there there may be one that suits my ears better.

Budget is up to $4k used or new

Any good suggestions please.