Power Regenerator or Conditioner for Digital Sources

Ok I'm having a difficult time deciding. I want to clean up the power going into my Aurender N20 and my MSB Discrete DAC. Those components seem to me to be the most sensitive to power issues. When I plug them into an inexpensive APC Power strip I get a slightly harsh upper frequency range. When I plug them into my Cullen Power Box that has no surge protection just straight from the wall power they sound much better especially the DAC which is the more sensitive of the two. However summer time power issues do have their effect

So I am considering either a quality power conditioner such as the Isotek Aquarius V5 or a PS Audio Stellar Power Plant 3 for just these two components. I need three receptacles as my DAC has two power supplies. My Amp will stay plugged into the wall where it sounds the best.

Anyone own either of these power units? Experiences with them?

Alternatively there is the Puritan 156 Conditioner at a lower price however recent reviews on Alpha-Audio where they did extensive power conditioner tests strongly favored the Isotek Aquarius V5.