I have sold the Benchmark and decided on the Woo Audio WA6.
It seems to do exactly what I am looking for. Another amplifier in my system that is designed for and dedicated to powering my headphones.
The Wyred 4 Sound preamplifier is so versatile that it has four outputs (and now I am using them all
)... To the ARC amp, the First Watt amp, both subwoofers, and to the headphone amplifier!
With quite a bit of research I have read a lot of good things about the Woo. I also appreciate that it is an American made product. I like that it has the ability to roll tubes if I ever get to the point that I want to play around a little.