Upgrade path from Adcom gcd 600


I just upgraded my system and scraped together enough funds to go from B&K amp and pre to ARC SP9 MK2 and McCormack DNA-1. Not a huge step by any means but, at least i have units that i can upgrade as soon as more funds become available. Next I am looking at my CD changer which is an Adcom GCD 600 that i bought ten years ago. I would like to get some suggestions on CD/SACD and perhaps DVD in the same unit for <500 used that would make a difference in my system. From reading the threads it appears that there are significant improvements in even the low end models to justify an inexpensive upgrade. Appreciate any suggestions...
eagleman6722
you might want to look at this model.

http://www.oade.com/Home_theater/sony/dvd/dvpnc555es.html

I'm quite sure its under $500. Check with Oade to see if they offers their opamp upgrade for this unit which is reported to bring out a better redbook presentation. Doesn't do DVD audio but everything else and being an "ES" version it does come with a decent warranty. Not the only choice in the marketplace but a definite contender within your budget...
I changed the subject as it may have been misleading. I am looking for suggestions on a more current SACD/ CD/ DVD player that would sond better than the adcom GCD600.