Power Conditioners

Try the Monster Cable one. At $179 it is much cheaper than many of the others and it works well in my system. (I cannot say that I have directly A/B'd it against the competition, but the improvement is noticeable and I like the price!) They also have a slightly less expensive one with fewer outlets. (System: Thiel 1.5 speakers, Golden Tube SE-40 monoblocks, Modulus 3A preamp.)

You may want to add the Sound Application CF-X to your list, I own both and the CF-X beats the Hydra hands down.

I have also used those Blue Circle BC86 Noisehounds Power Pillows. They are a parallel filter. They so not have outlets. They work wonders if used with a low cost conditioner. Even with a high end conditioner, I notice some difference, mostly in the blackness of the background.