Hubbel v Virtual Dynamics v FIM v Purist v Jena

and also dependent upon taste. I am using the Acme outlets and would not describe them as bright; I would describe them as energetic, quiet, and they are definitely highly resolving. Have not tried any others as these suit my tastes just fine and who wants to swap outlets on a regular basis. I would perhaps try others at some point out of curiosity or in response to someone's recommendation. BTW, I use the cryo treated 15-amp version of the Acme. The Acme's definitely provided an immediately apparent and truly significant upgrade for me. I would recommend anyone just entering the power upgrade market to do the outlet upgrade prior to auditioning power cords.