I'm surprised there has been no reco for the Shunyata Hydra 8 yet. That 's the one I would recommend, of the ones on your list. I currently am using the original Hydra with an Anaconda vX cord. It was a huge upgrade over my previous conditioner (Audio Magic Stealth). The Stealth was quicker, but the Hydra is much more musical. You can almost see the rosin falling off the bow. The attack and decay of notes are more natural. Comparing the original Hydra with the newer Hydra 8, is a matter of tastes. The 8 is more dynamic, but not as rich and full, IMHO. Which ever Hydra you wind up getting, the Anaconda vX power cord should be considered a mandatory accessory. YMMV.
Regards,
John
Regards,
John