Can anyone recommend a DVD player ($200 or less, new or used) that has
very good 2 channel audio?

OPPO 980.

But do you really want to spend that much money at this point in time?

Hint: Blu-ray.:)

I'm not much of a movie fan,and don't plan on buying Blu-ray discs.I use my current
DVD player to watch concert video's and listen to CD's.My 4 year old NAD T533 is in need of an expensive repair job,and can't justify the expense.Thats why I'm looking for
a new player.

Then the 980 is what I (and many others) would recommend.

http://oppodigital.com/dv980h/default.asp

http://www.avsforum.com/avs-vb/showthread.php?t=879341

http://prillaman.net/oppo980_review.html

I have owned one for almost 1.5 years with no problems and will keep it around for the various region 2 discs I have.