Power Configuration with Monster HST1000 MKIII

By appliances, do you mean all your equipment? Or do you mean ADDITIONAL household appliances, like microwaves, blenders, toasters and vacuum cleaners? If you mean the latter, I suggest you have enough reserve there for all your audio/video equipment, but not running, say, a vacuum cleaner at the same time you are running your entertainment gear!
While you could plug other applicances into the 1000 MIII, you should not run any appliance likely at the same time as the rest of your system, depending. (i.e, how much wattage and current you are requiring with additional)
As for your equip listed above, you have plenty of room, and are not running out of freed up amperage.
I think you have something like 1800 watts of range with a 15amp rated piece like the Monster. Totaling all of what you have, you should be well within that operating range, I believe. And you shouldn't be pulling more than 10 amps at any give time, likely.

Plugging a blender into a line conditioner. LMAOROTF

By appliances I mean audio/video. I try to keep my stoves and fridges in the kitchen:)

Thanks for the follow up. My main concern is that the user guide for the Monster PC is a bit ambiguous about whether or not high current receivers should be plugged into it. It says that they won't be harmed but that it is advisable to only plug in "audio" equipment". Since the HK AVR146 has a "high instantaneous current capability" of +-25 amps and the power center has max amps of 15 I thought that it might not be suitable for the receiver. But even Harman Kardon seems to think it will be fine.