OP,
After I installed my dedicated lines, I tested out a bunch of receptacles from the usual audiophile suspects: Oyaide, Furutech, Acme, Synergistic Research, Cardas, Wattgate, and a couple of hospital grade.
The best 3 by a good margin were the Furutech GTX-DG (gold), Furutech GTX-DR (rhodium), and Oyaide R1 (not the SWX series). My personal favorites were the GTX-DG and the Oyaide R1, but I can see someone needing more detail preferring the GTX-DR