[masraum]

For sitting in the car, get something cheap in the size that you want from HD, Lowes, HF. It's pretty hard to go wrong these days.
If you want to go with something nicer, and more expensive, but still on a budget, check out olight brand stuff. And they have a sale on, or starting soon. Olight is similar to the really premium stuff, but at better prices. And there quality seems comparable to me.