Wasn't quite sure where to place this so move as needed.

I am looking into isolating my machine from any interference of other electrical appliances. I have done as best of a job to keep all my hardware on one circuit in the office area of my house but I still receive clicking noises that are so annoying from my speakers that I am about to disable sound all together.

I am looking for a good recommendation on a UPS that would also provide isolation from any interference from anything else. To start, the main PC in question will be the only one plugged into it.

It must maintain 10 minutes of uptime with just a pc and monitor
Have at least 2 USB connections and a fast switch over 2ms or less.
I have normally stuck with APC in the past but just to give you an idea of how old my backup is? It takes some strength to move it, sits on a rack with wheels and I have replaced the batteries (all 6) 5 times, let's say that.

Any direction would help. Trying to keep it in the 200 range.