I'm paranoid about not being visible enough (and like to be able to see where I'm going!)

I have Cateye's super-bright front and rear lights:



The front headlight is so bright that when on cyclepaths, I've seen folks think some kind of UFO was about to land in front of them!
I also love the tail light as it has two rows of LEDs, which can be set to either constant, flashing, or a whole host of combinations.
As with the front light, it's mega-bright and has excellent visibility from the side too.