i use the Shunyata King Cobra II with my SA-1. the KCv.2 is plugged into a PS600. with this combo i get a lower noise floor, better dynamics, more ease in the presentation, and a more layered and deeper soundstage. the KCv.2 seems to do about 75% of the improvement compared to 25% for the PS600. i have not tried the Hydra but i am led to believe it improves on the PS600. the SA-1 is a very hi-rez source that will benefit from good care and feeding. everthing seems to matter.
