I never heard either, but I have the P-5003, which was the older Celeste line equivalent of the P-3. That is, it was the same as the more expensive top of the line P-5002, but without the outboard power supply. The factory told me (I have no local dealer) that they had a hard time selling the 5002 because the difference in sound was so much less than the difference in price. The P-5002 was discontinued when the Moon series came out. My guess is that if you already use a good power line conditioner then the P-3 is very close to the P-5. If you don't have a PLC, I would bet that buying something like the PS300 and a P-3 is a better value than a P-5 because the PS300 will improve you CD and tuner, too, and more than the improvement you'd get from running the unconditioned sources through the P-5.
