I had the PS Audio P300 for a few years. Just sold it and bought the latest Hydra. It sounded much better than the P300. But the P300 couldn't accomodate my Mark Levinson power amp. I can plug in everything from source to power amp into the Hydra. My system do sound better IMHO. Perhaps someone out there who have the PS600 and the Hydra could give you better assessment.
