Recently got addicted to the Shin Megami Tensei games, and the music; which are the best Megaten OSTs in your opinion? So far I've only listened to the Raidou Kuzunoha vs. the Soulless Army one, and I think it's pretty good.

well....i think Persona3 or Megaten3 - nocturne is the best. and i especially love shin megami tensai 1.

I'd go for either Shin Megami Tensei: Nocturne or Digital Devil Saga 1 if I were you.