best power conditioners under 4k


Hi folks, i want to buy the power conditioner under 4k demo, what it the best option, any suggestion it good! thanks!!
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Hello all 

So I went with IsoTek evo3 sigmas conditioner, and am happy with the unit. 
Clearer TV,  Noticeable difference in sound quality. 
I am trying a Vibex currently. Certainly bests a Shunyata that I tried recently that retails for over $ 5K.
Overwhelming choice is an ADD-Powr Sorcer X4. Next choice is an X2.
Finally a Wizard.