recommendations on a good used cd player for under $750

It's a risk buying used but you'll likely get much more of a player over a new one at the  same price; plus the new player is worth about half once you crack the box.

Marantz, NAD, and Cambridge players are all very good in that range new. If you have a nice system but not the most revealing, no doubt you'll be very happy with a new player from about any manufacture in your budget. Not sure anyone really makes a bad player today unless you buy it at Walmart.

If you're looking for a great used player and don't need Blu-ray or SACD the Cambridge 840c is a player to consider. On a system that can reveal the differences between components the 840c is going to pull ahead of the new players in the same price range. 

Marantz and and the others are really good players, but you'll almost always get more buying used. If you're wanting to stay closer to $300 then definitely agree on a newer Marantz. 

I would try the Emotiva erc-3. I have heard nothing but good reviews about it ($499).

Having owned one in the past I can second the vote on the Cambridge 840C.

I can third the vote for an 840C.

Bill

Look for an Oppo BDP 95, used they go from 600.00-800.00 on the used market. Run it in Pure Audio Mode with either Variable or Fixed Output. Sounds awesome and you can play concert BDVD through it with awesome sound quality!

just my 2c