Bôa - Duvet from Serial Experiments Lain:
Radiohead - Paranoid Android from Ergo Proxy:
If you like Bôa there are some Bonus Tracks on the Armitage OST featuring Jasmine Rodgers which are very schway in my opinion:
I'm also a fan of Yoko Kanno. For example hanna from the Zankyou no Terror OST:
I'm using cdjapan, youtube, nyaa and various private torrent trackers to get anime soundtracks.