Coming for a caver... You didn't say what you wanted to use it for.
So you want cheap, reliable, bright, and light. Doesn't exist. The Energizer is cheap and reliable but not all that bright and certainly not bright (at least as of a few years ago).
Petzl's are OK but a bit pricier (not terrible though). Not a bad compromise. NOT waterproof.
I like the Princeton Tec's. They are incredibly waterproof. I've killed two over the years though.
TAG lights have the best reputation for caving but they certainly aren't light or cheap.
Many cavers still use carbide lights. I don't suggest using them to work on your truck due to the open flame... plus they stink if they aren't adjusted right.
Check out IMO and bob&bob before you buy.
http://www.innermountainoutfitters.net/
http://www.4bobandbob.com/