I haven't heard it, but the HD25 is one of the most sensitive (almost obscenely so) high end phones out there, and thus can be driven by anything it would seem. Of course they are closed, and I wouldn't know if they sound good or are comfy or not. They are very high on my list to audition for portable use.
Easy to drive, open, and comfy is really a difficult combination it seems!
I guess I would recommend the HD545/565, although they really don't do well with underpowered portables. They have quite poor sensitivity, but work fine with 15mW portables and soundcards. It's really tough to recommend anything without an amp given his strict guidelines. Based on comfort and drivability alone (not having heard the sound) I would have to say the HD495. Better yet the SR60 which I have heard. The SR60's can't fit him all that bad can they? I can't last 30 minutes with bowl pads, but with comfies I can go for hours.