I agree with:
Guided By Voices
Netrual Milk Hotel (pretty short-lived though)
Radiohead
Spirtualized
White Stripes
I'd add:
Super Furry Animals (!)
Blur (MUCH better than Oasis for Brit-Pop category)
The Verve (short-lived too, but also better than Oasis)
The Strokes (one-CD wonder but a good one)
Dandy Warhols or Brian Jonestown Massacre (indie vote)
Flaming Lips