If you're going to move from what you currently have to a power regenertion unit there are better components out there than PS Audio. Try looking into a used Exact Power unit or one of the APS units. Otherwise I think the UO is one of the best products PS Audio offers.
PS Audio UO vs P300 or P500
I'm wondering for an improvement in sound quality is it worth purchasing a PS Audio P300 or P500 Power Plant when I already have two Ultimate Outlet's? The UO's work very well though they definitely work best when you don't mix digital and analog into the same UO and when there's nothing but the amplifier plugged into the other UO? Thanks