Visit candlepowerforums.com (one of my several online homes) and you'll find there are quite a few awesome lights available out there.
I've got quite a few wonderful flashlights in my collection, and among them all, I feel the Quark line is one of the very best choices. Of all the Quarks, I like the Quark AA-size model which I power with 14440 4.2v li-ion rechargeable for outstanding potency ... but they can also be powered with a AA size lithium primary (15 year shelf life!), a AA size NiMH rechargeable, and if you're really in a jam or in any podunk location and need to buy batteries, it can also be powered by the lowly (though ubiquitous) AA alkaline (yuck). This powering versatility is seriously significant because you have an amazing variety of powering choices depending on your needs.
The Quark offers numerous multiple output levels including an extremely bright turbo level and a VERY low low (this uber low moon mode feature may be far more useful than you might think it is), multiple modes, forward clickie, reverse clickie options, momentary feature, warm or cool color emitters, etc. And the Quark system is highly modular... you can play flashlight barbie with numerous heads, tubes, tails, and switches. A HIGHLY recommended choice.