As I know the Cree bulbs are excellent, I recently busted my £10 LED torch from Tesco's. Perfect excuse to go shopping. So I looked into the idea of a Cree Torch, and I am glad I did!
Just had this delivered:
Blinded myself several times with it so far, it is extremely powerful, and only needs 3xAAA batteries, and it only cost just over £8!
I would suggest it is an excellent piece of kit for the car. Small batteries, and the LED chip means that it should hold its charge, and use it slowly, but with an excellent output, and its a light waterproof (within reason) design, and so even if it gets a little wet, it wont fall over.
If anyone wants any photo's of its operation in the dark, I will have to see what I can sort out for you!