I recently auditioned the Luxman SQ-38u integrated amp. While it didn't work with my speakers of choice (ProAc), it was absolute MAGIC with my AKG 702 cans. Problem is, I don't want to spend $6,000 for a headphone amp.
I only heard Sennheiser HD-800 and Grado GS1000 on the class A tube section of a Peachtree Audio iDecco. It was damn good. I suggest an audition. I'm planning to go that direction.
Given your description of the Luxman I'd audition the Eddy Current offerings if you can find one to audition, or perhaps the EAR. The Luxman headphone amp seems a natural as suggested. Though the Woo's are excellent choices too and posses some of the qualities you describe, I would not necessarily call them "warm" though they are all tube-amps. They do make the 702's sing though.
I have the Luxman P1u and a Leben CS300XS. You might want to audition the Leben, it has a wonderful headphone out and might play well with your ProAc's.
What didn't you like about the Luxman / ProAc combination? Which ProAc's? I ask because I'm considering the addition of another system (integrated/speaker) and the Luxman SQ-38 and Leben CS600 integrated amps, and ProAc speakers are on the short list.
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