I highly recommend the Richard Gray system since it is a "parallel" conditioner. Chris Johnson is probably most concerned about current limiting - NOT an issue with the RGPC 600 or 1200 (or even 400). Being a parallel conditioner, it is the most effective at eliminating line noise without imparting it's own signature.
My experience with the Hydra is that it was a little too smoothing for my system but may work for you. But, again, it will be inline with the power and probably what Chris Johnson is suggesting you avoid
My experience with the Hydra is that it was a little too smoothing for my system but may work for you. But, again, it will be inline with the power and probably what Chris Johnson is suggesting you avoid