Voltage regulator in the power chain

Yeah, I think the APC is going to be the weak link in your system.  It's really designed for keeping constant voltage for computer type systems (which can crash or error if voltage drops from a brownout).  It's probably has highly switching circuits that equalize the voltage to be constant.  This will create noise in the A/C.  Also, it has weird sockets (more of the computer type sockets - for special computer power cords).  Has a smaller EI transformer.

http://article.techlabs.by/img/article/34199/APC_LE1200I_general_view_11.jpg

If you really want voltage regulation, I would look for a used Monster AVS 2000 (typically around $400-500 on ebay or google search).  It has a very large toroidal transformer that contains a variable tap input.  It uses a motor to move to the proper voltage tap output on the transformer and gives you nominal 120V output (even if A/C is lower or higher).  The idea for audio is to have a smooth A/C.  It doesn't have to be constantly 120V.  If it varies a little bit, that's fine, as long as it's smooth waveforms.  You can always look at PS Audio conditioners if you want a more exotic and high-end voltage regulator / conditioner (very expensive).

Otherwise, if you are just looking for a powerbar, try an Emotiva power strip or a Belkin PureAV conditioner.  Both can be had for around $100.