The HDS systems flashlight are the coolest LED's. They are small enough to carry every day but are incredibly powerful. The only downfall is the price but well worth it. They also have a rechargeable CR123 lithium batteries available. They are well worth the small expense as you will not need to pay top dollar for the standard batteries.
http://www.hdssystems.com/index.html
http://www.tadgear.com/x-treme gear/electronics main/lithium_cr123_charger_kit.htm
http://www.hdssystems.com/index.html
http://www.tadgear.com/x-treme gear/electronics main/lithium_cr123_charger_kit.htm