CD - upgrade, replace used, buy new?

There are new old stock Aiwa XC-37M on eBay for auction.

I have to disagree somewhat regarding some of the above comments on the PD-93. Yes, this is a beautifully made machine, but I find its sonics lacking in many regards. I bought 3 of these units brand new at quite a discount, sold one to my brother and another to a friend, neither of which are audiophiles. It was a great value for them both. The third unit I sent to Stan Warren for the full mod. I was still less than impressed, but it certainly was not offensive in any respect. About that time I bought a new Pioneer Elite CLD-79 LD player for my new surround sound system. This had the new Legato Link and I wanted to try it in my main system to see how it compared to the modified Stan Warren PD-93. There was really no comparison, the CLD-79 was a vast improvement in all ways. Fortunately I was able to sell the PD-93 at a profit and move on. Since then I have owned several different CD players or DACs including Meridian, Sony ES, Accuphase, Adcom, and am currently on my second Audio Logic tube DAC. The Audio Logic is easily one of the finest DACs available at any price. After selling the first one I just couldn't find anything as good including the Accuphase DP-65. I use it with a CEC TL2 transport and Genesis Digital Lens. I bought all of this equipment used and have $2700 invested (not bad for a $10,000 retail system...thanks Audiogon and the depreciating value of digital seperates). Getting back to the original querry, the best CD player value I've had in my system (and very much in your price range) was the Adcom GCD-750. Great build quality and you will have to spend a lot of money to beat this player. It was closer to the Accuphase DP-65 than I could believe considering the difference in price of close to $5000 retail. I don't see these for sale often on Audiogon and I suspect it is because they are keepers. Worth waiting for though and I think you can pick them up for $6-700. There are other recommendations I could make, but this one stands out clearly in my mind. There are some excellent reviews on this player if you look around. Good luck.

Consider having John Hillig at Musical Concepts mod the PD 93. Done right you'll have a better player and a fine transport when the time comes to go outboard.

Tswhitsel: You seem to change components so often, how can I tell if anything is good or bad? Stan Warren recommends a month of burn-in on his DVD player mods to get to 100% of its potential. Out of the box they sound thin.

Bowbow...actually I don't change equipment all that much, but I have been in this hobby for for over 23 years. I've been using Aerial 10t's for a little over 6 years. My Well-Tempered Reference table and arm are a good 10 years old. I used the same Van den Hull Grasshopper cartridge for almost 10 years before changing to a low output Grado Reference, which is a better match with the arm. I use an EAR 834P phono preamp that is about 6 years old. My BEL 1001 MK3A's are also somewhere around 6 years old. The Stan Warren PD-93 I owned for one year, but after hearing how good the CLD-79 was I decided to keep looking. I don't think the fault was with Stan's work by any means. My goal was always to find digital that at least approached the quality of my turntable set up and it is true that the highest turnover in my system has been digital because that has been a difficult goal to achieve. The Audio Logic DAC is the most musical and analog sounding DAC I've heard. I sold my original Audio Logic, Sony ES (used as a transport)and Joule Electra preamp to a close friend during the year that I was building a music room and could not use them. After the room was finished I tried the Accuphase and the Adcom. As good as they were thery were not the Audio Logic so I picked up another Audio Logic and the CEC TL2 on the recommendation of a friend (that turned out to be excellent advice). The Genesis Digital Lens is a recent addition and well worth picking up for what people are giving them away for these days......So, to answer your question, how can I tell if anything is good or bad? My answer would be that I have been using essentially the same reference system for many years and am very familar with its sound. And it is a very good system capable of tremendous detail and musicality. I have also gone to the trouble to build a very good room(this is the second room I've built, both very similar), which is usually the weakest link in an audio system. That said, these are just my opinions and they reflect my particular listening biases. None-the-less, I believe my experience in this hobby is seasoned enough to offer advice to those who ask, and that's what this forum is all about. I hope this helps and that you find my experience to be of some use.