power conditioners in $3000 to $5000 range

Thinking of getting a power conditioner and have been reading up on Audioquest Niagara 5000 and Furman IT REF 20i.
Any thoughts on either or other choices. I plan to use only on audio at this time. Thanks for any input.
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Audioquest would be my pick.
There was a review comparing the Niagra to a PS Audio unit, but I seemed to have deleted the bookmark.
We have tested most of the units on the market the audio magic was far better rhen the audioquest 

Dave and troy
Audio intellect nj
@audiotroy Do you carry the Audio Magic?
Had both and now have the SR Powercell 8 UEF SE. a lot of SR haters on Agon but it is what it is. Phenomenal!