I have had good success with the affordable Tara AC Reference, better results with the Tara Decade, and a bigger improvement with the Tara Air.
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For the money, you might want to check out the Voodoo Mana at $175. It's every bit as good as the Synergistic AC Master Coupler, which I owned 2 of at one time but "upgraded" to the Voodoo Manas and saved some major bucks. It's a much better built cable and more dynamic, in my humble opinion.
Best of luck