I am a big fan of Danny Kirwan as well. When it comes to the ability to switch from heavy blues/rock vibe to delicate jazz vibe, he had it all down cold. But even more than Peter Green or Buckingham, he was a huge mental case. Supposedly he is a full blown alchy now to boot.
I love Jeremy Spencer too. The Elmore James stuff was pretty authentic, and I still love his first solo album with If I Could Swim a Mountain. For Somebody's Gonna Get Their Head Kicked In Tonight alone he is tremendous.