Best used cd player under $1000

jupiter2000 is very nice.

The old time JVC XL-Z1050TN, which runs about $125-175 routinely, has continued to surprise me with its fine performance for the money as a CDP, and as a transport, with full remote control facilities. Solid build quality is evident when you lift this component.
Even has an enjoyable headphone output, until later upgrading to an outboard headphone amp, which offers excellent private listening, provided the interconnects are of high enough quality.
A bargain hunter's dream, delightfully free of any digital listener fatigue, despite its vintage status. Maybe, not the best, but worth bringing to attention of those on a budget.

I'll second Jlamb's suggestion.

Rega Jupiter 2000.

Cool looking player and top loading.

It wont play SACD and doesn't upsample...but my Wadia 23 is a steal at a grand used(if you can find it) Wadia digimaster 19 bit res is good enough to hold its own on redbook cd today.I have owned Cary 308T, Cary 301, Philips 963, Cal Labs IconMkII, Rega Planet, and the Wadia is the boss here.BIG powerful bass and smooth midrange sound. Lots of depth and correct timber.A little dated now..but still Wadia's entry player in 1996 still rocks. I keep toying with getting an upsampled DAC such as Musical Fidelity's new 21 and using the Wadia 23 as a transport..maybe somewhere down the road. This Wadia wont break the bank and sounds much like its bigger siblings. Just My opinion of course.-Enjoy.

Vecteur L-4 is a real good one.
I prefered to the Jupiter and the Sony 777es which are also good in this price range.