I've gotten better sonic results with the PS Audio UPC-200 AC power filter and it protects my gear, as well. YMMV.
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Just have an electrician swap the panel out for a bigger one. I had to do that at my other house. It was not that expensive.
In my current house which are square D breakers they were able to replace one single slot breaker with a single slot dual breaker thereby enabling them to add another circuit for my home theater. Problem solved for an extra circuit.
I don't know about power conditioning for amplifiers but I am interested. I know the dedicated circuit adds a lot to a high system for low cost but I would still like to protect my amplifiers from outside occurrences.