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.
128x128uberwaltz
Used REGA Isis valve cdp/DAC...

 Goliath killer .... google the reviews
 
Two big advantages:

(1) with its direct USB input into its high-end DAC and the separate USB input button on the remote, your digital files are played on your external HD.

(2) REGA has two matched serial number transports set aside for each unit sold so that longevity risk is eliminated 

highly recommended 
If you think you may have any interest in exploring non-physical media you may consider putting that money into a DAC. You can use the DAC with your current CDP and improve sound quality and also have flexibility down the road.
I would get a used Esoteric player.  It will last a lifetime and are better than most.