I also use a Running Springs (Haley) with great results on my 225 watt amp. I found that when I plugged my amp straight into the wall (front-end in the RSA) I would get some faint buzz in the speakers. With everything plugged into the Haley it is quiet and I don't notice a restriction in dynamics.
I also used a PS Audio HC/UO at one point and had good results with that as well.
I also used a PS Audio HC/UO at one point and had good results with that as well.