Synergistic Research is my list.
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I run an Audince Adept Response.It made quite a difference for me. I already had 20 amp circuits, direct lines, etc.The nice thing about this conditioner is that you can plug your whole system into it, including your amp without chocking it out. It is kind of a pricey unit, but well woth every penny.
Another option is the Majik Buss. Pi Audio Group has products at both $595 and $995. Neither model is current limiting and they really cut the EMI coming in from other sources.
They made a huge difference in my system and are affordable. I wrote a review here on Audiogon if you want more details on my experience.