new cd player or old


Hi-I am trying to upgrade the sound of my cd source from a horrible old toshiba dvd player-I have about $300-500 to spend. What gives better sound-a quality used cd player from 10 years ago, or a new NAD player? Thanks.
tbromgard
Post removed 
Also am having same confustion to buy new cd player
becoz recently I have sold my MARK LEVINSON cd player and go for new one. In my mind one of from these players for to keep long. My other compnents are Pass XA30.5/Pass pre/Dynaduio speakers/Siltech cables. Anyone suggest me for good player on experience which will help me lot.

A) The new player from Sony........XD5400SE (CD/SACD)
B) NAD Master series...............M5 (CD/SACD)
C) YAMAHA..........................CD2000 (CD/SACD)
D) BRYSTON ........................BCD-01 (ONLY CD)
E) CAMBRIDGE Audio.................840C (ONLY CD)
OR
My second systems source of marantz with your new DAC
(Benchmark/Belcanto3/Cambridge).

Thanks.
HI-Thakns for the suggestions. I purchased an NAD and I am really surprised how much better it sounds than my old unit-right out of the box. Recommended for anyone thinking of an inexpensive cd player.