I like Sugarbrie's suggestion for a used CD6 and a power cord upgrade. The CD4-CD4a-CD6 series was good value for the money.
I also like the Shanling CD-S100 / Music Hall CD25 player. You can get it new for under $500 and it will sound better than a great many older players selling used at that price.
I also like the Shanling CD-S100 / Music Hall CD25 player. You can get it new for under $500 and it will sound better than a great many older players selling used at that price.