I also like the Planet Bike Superflash. One of my neighbors told me and I quote "dude, it looks like an ambulance when you ride up the street..." (okay, I say he's exaggerating a little...) but it is pretty bright when it's in the flash mode.

I also have the Planet Bike 1 watt front light too.

I'm pleased with both, and I think I paid about $60.00 for both. I know there are better ones, but it works for me.