Looking for a CD player


Dear community,
I listen to CDs only and I have owned an entry level AMC CD9 CD player for the past 15 years.
Over time I modified this unit to the max with very good results.
Now I think I am ready to move on to the next level so I am looking for a used CD player under $1,500.
One that can be further improved would be also interesting.
Do you have any suggestions?
Thanks!
sounasega
thanks everyone, the search list on hifishark is getting pretty long...
Looks like a lightly used Cambridge CXC or Audiolab cdt6000 could fit well.How about the border patrol dac? Any experience?
Check out the Denon DCD-1600. Built like a tank, excellent DAC, about $1,200 with a 5yr warranty. I bought it because I wanted a really good 2-channel SACD player. It’s “Made in Japan” and it shows. 
SACDs sound sublime, but most of all I was surprised at the amount of additional detail the Denon pulls off Redbook CDs. 
FWIW, PS Audio decided to use the Denon transport in their new CD player...
+1 re the Denon DCD-1600NE.
My first SACD/CD player was a Marantz SA8004.  I replaced it with a Denon DCD-A100, which I bought gently used.  That was a big step up, but eventually I began to be tempted by the DCD-1600NE and the idea of buying it new so I could take it to a service center about an hour away, if I needed to.  Surprisingly, that was another step up.
As the previous poster said, the improvement in redbook CD's is especially notable.
Hello,
All of this looks good. If you have a ok DAC you can sell it and buy the R2R Denifrips Arries.II. If you have a CD player with digital outs keep the player and spend it all on the DAC. The Denifrips Pontous. Slightly over budget but worth it. It’s all about the DAC. This DAC has twice the resisters and twice the power supply located under the DAC for better separation. Even if you had an older DVD or blueray player you will hear the results. Later you can upgrade your transport to a used Oppo, Cambridge cxc, or a jays. This is your best bet for the most impact and future proofing your system. You can also use the DAC for streaming in the future. I would recommend a BlueSound Node 2i. 
I hope this helps. I don’t know of a resellers for Denifrips. The BlueSound is at https://holmaudio.com/bluesound/