I know SureFire has already been mentioned, but I think the SureFire G2X Tactical would be a good choice. High quality, reasonable price, comes in 3 different colors. I have a couple of SureFire G2X Pro lights and they have served me well for several years.
SureFire G2X Pro in yellow. Will be my in-car light. I wanted two levels and something that's relatively easy to find in the car. Got a great deal online so pulled the trigger.