Considering getting a CD player (again). Used? New? Criteria?


After years without one, I'm considering getting a CD player. I'm not against streaming, but I have many CD's and would like the simplicity of just playing them from time to time. I probably want to cap my expenditure at $700, or so, because this won't be the only way I play music.

A few questions:
If you've purchased a new CD player, what did you buy? Why?
If you've purchased a used player, how old is too old? What factors helped you choose?

My concern with used is that the transport mechanism of older players will be getting tired, and this won't be knowable just because a unit "checks out" with the site (or individual) testifying to the player's working condition. There's got to be an average point for many machines to give up the ghost, mechanically (varying from machine to machine, of course).
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I use an old but overbuilt Marantz player's digital out to a Cambridge DAC with a regulated Pangea (no longer available, but a Peter Madnick design) power supply, and will be bummed when any of these things fail as they sound amazingly good
Further to my intial reply ...i've now found and got a Marantz 6000 SE Ki CDP ...which i must say i'm finding best use purely as a transport with its optical out into BenchMark Dac1 HDR to act as the Dac & Pre then via XLRs onto Cyrus Mono Xs and into Klipsch Quartets .... going directly via the CDP along with the Cyrus Amps makes the sound too bright, so i'm sure that with different amps it would sound much less bright ...but having all 3 options of Coax/Optical & Analogue RCAs this CD has got it all covered and at under £200 will be staying
For those with limited funds, the Marantz CD6006 ($499) is an easy recommend. A very musical player with good build quality and a 3-year warranty.

https://www.whathifi.com/us/marantz/cd6006/review
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I got a good deal from a friend on a Cambridge Audio Azur 840 CD player after my mint used $40 Rotel 855 went kaput.  All I did was move the 855 into another room and then the laser stopped reading discs.

The Azur 840 is very nice but seems very analytical sounding and I actually prefer the 16 bit Rotel over the Azur.  
Note, with my amp (Onix OA-60 dual mono int), I do not have the capability to listen to the Azur in balanced mode which is supposed to be much better.  The Azur also has many other DAC features built in, that a dinosaur like me doesn’t know how to use yet, as I still enjoy my LPs and cassettes :)