Recommendations for a good headphone amp?

I have an Apogee ensemble, and the hd 600's seem quiet. I have the headphone out turned almost all the way up. My audio Technica's hit the same perceived volume at half the volume on the knob.
 
At the office I use a Scarlett into ATH-MX50's.

In the studio I split signal from the board and computer into a Schlit IEMagni and Shure SRH1840's. This is where I do all my mixing and I am quite pleased with the combo.
 
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