Fixing the wiring first sounds like good advise. -- As to AC accessories, my guess is they all have their own character. As an example, I've tried the PS Audio P300, Ultimate Outlet, and Juice Bar (and still own and use all three) with a single brand of upgrade power cord (Silver Audio Power Burst). The Power Burst gave tighter bass and more clear mids. The Ultimate Outlet improved the blackness around notes with a 'mellow' presentation, the P300 also improved blackness but resulted in a very refined high end. Since I feel most systems overemphasize the high end, I nearly discarded it, but upon further listening concluded it did not exaggerate but rather 'revealed' the high end (just an impression without factual basis). I'm using the UO in a dedicated headphone setup and the P300 in my main system (but I've read that you can use them together). The P300 didn't have enough outlets, so I used a relatively inexpensive power strip that allowed use of your own power cord. After having cords loosen in this strip I bought the $200 Juice Bar on a 30 day trial. No contest, immediate improvement. -- I neither have the time nor money to compare all or even many of the different power cords, conditioners, outlets, etc but from this limited experience believe that for a given system they will all have an impact in different ways in much the same way that different interconnects and speaker cables give different results. Good luck.