I have no expertise at this stuff, but what I have heard over the years is that power conditioners for HT are nothing more than a rip off, whose purpose is to bilk the credulous. I have my equipment protected by UPSs and spike protectors, except for TVs (thinking TVs probably have especially robust protection already).

Greg
VP180, M80s, M22s, QS8(4), CSW S305s, EP500, Pioneer VSX-90
M2i, M3(2), Pio vsx-1020