I'd probably end up killing myself if I only had Portishead - Dummy. ;] I love Portishead mind you, it'd just make me feel too gloomy.
Either:
Felix da Housecat: Kittenz & Thee Glitz
Cowboy Bebop soundtrack - Blue
Boa
The Ids - Psycho Babylon
Ladytron - 604 or Light & Magic
David Usher
Jet Set Radio soundtrack
Cornelius - Fantasma