buy upsample processor or new CD player? Or ... ?

I guess I'm working on an entry-level system, and am looking for bang-for-the-buck options to compliment my cd sound. What I'm working with: Vandersteen 2ce signatures, Sony 79es 5-disc changer, Denon 3802 reciever. I'll be able to shop for cable this summer, but right now I have MIT T-2 speaker cables and Coincident ICs. I just read about the GW Labs DSP upsampler in Bound for Sound, and for $399 it sounds like an interesting way to get more out of my non-SACD/non-DVDa CD collection. I think my CD player needs to be upgraded as well, but I can only afford to do one or the other. I am considering either a used Rega Planet or a used AH! Njoe Tjoeb 4000 if I can find a good price. I'm especially interested in feedback from anyone with the GW DSP or something comparable. I just wanted to hear what the better options would be. As I see it, the GW is an intriguing but unconfirmed step up that my current CD player might not do justice. Thanks in advance for your advice; I'm just starting out and have had really kind input here on Audiogon so far.