I am currently using the same source and phones in my office setup, and can readily endorse the microZOTL. I do agree that it is a touch more laid-back than some SS amps I have heard (Headroom). Nonetheless, I find this to be a good match with the Ring DAC of the Arcam, which I find to be very detailed, yet forward. Good luck - a great headphone setup can amaze and engoss you.
Headphone amps
I like to listen to music at night - my wife likes to sleep - I can't understand why she does this with so much good music to hear. Headphones have been a blessing for maintaining peace given our somewhat different nocturnal patterns. I'm soon getting a new integrated amp without a headphone jack, so I will require a little amp for the headphones. Please provide recommendations for headphone amps that you have used and loved. I like to listen to jazz and classical at night. I'm using a FMJ 23 as a source and I tend to like tube sound. I have Sennheiser HD 600 headphones.