I am currently using the HD598 with M1DAC & M1HPA. The sound is overall balanced and just a little bit warm, and I really love the sound this combo produces. However, I want to find a headphone that provides more detail and a little bit more bass, but still maintaining the overall balance. I am also considering replacing my dac and amp after deciding which headphone I am going to purchase. My budget is around $4200 including the dac and amp. I usually listen to Japanese pop music and classical music.
I first tried most of the Stax headphones, which I found to be great in some areas, but not all. This makes the sound overall imbalanced, which I don't prefer. After that, I tried the HD800, which is excellent in the area of classical music. However, when I was listening to Japanese pop songs, it seemed that every instrunments were very far away from each other and simply couldn't combine together. The P-1u amp did help narrowing the soundstage a bit but it just won't work. The DA200, however, did add a bit warmth to the music, which helps "combining" the sound from different instrunments, but the details in DA200 is much less than that of P-1u.
Are there other options available out there? I guess I will try beyerdynamic t1 another day, though I don't think it suits me after reading reviews on the net.