I’m quite partial to Euryale and Stheno, myself, too. Cassandra, as well.
I liked Apollo when I was younger, until I read about his treatment of Marsyas.
Currently, I think Glaucus – the herb-eatin’ sea god – is my favorite, obscure little myth.
Though I’ve been reading up on Horus-Seth myth cycles, lately, and they’re quite interesting. But I fear there’s an Apollo-flaying-Marsyas, or Loki-raping-Sif type of myth lurking for Seth that’ll probably lower his appeal.