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
I've actually owned Big name and expensive Dacs, none compared to my ModWright Sony 5400ES; Not even close...
Thanks for the tube tips.  I will get the Tung Sol's and Phillips.  I knew I was on to something with this player when I asked my wife if she noticed any differences.  She did describe the resolution, air and articulation of the instruments. 
Have now lived with my "new" system for a while and just my thoughts.
Replaced both the krell power amp and cd player with Esoteric sa-50 and BAT VK600SE.
After selling off the Krells I am probably out $4k total with some new cables as well.
Did i get $4k perceived value?
Probably not tbh, the sound is different, some improvements but some reductions.

The low and mid bass is noticeably stronger and fuller, much more slam and as I listen to rock music that is a good thing for sure, not fat or bloated just more "iron fist" type of improvement, makes the Ushers work for a living now!
Vocals about the same, maybe a little more chesty but would be a tough call.
It is definitely more volume tolerant without becoming harsh as the Krells were apt to do, I can now watch the windows bow before my ears tell me it is distorting, a sure sign of the huge power reserves of the BAT.
But the soundstage has definitely suffered, a fair bit tbh. Even sitting with my eyes closed I can tell exactly which speaker each instrument or vocal is coming from with ease, a feat the Krells dismissed with ease, guitars would come in through the walls it seemed. That right there is my biggest area of disapointment.
And yes slap all this equipment in another room in another house with different music and ears and the results could well be completely different, I know that!
I suspect the BAT is the main culprit for the soundstage but after spending $4k its going to have to wait a while before I can splurge again!
Save a ton of money and have more fun, get a Blue Sound Vault 2! Rip, store and play. Analog and digital outs. If you want to improve it slightly you can get an external DAC to run it through. Also does HiRez streaming and downloads. $1200.....buy more music!