HDS 170 clicky is a "must have" for everyone. Built like a tank and ultimately customizable for the users needs. I've EDC'd mine every day since I got it, and don't intend to change, at least until I get my rotary! lol
Also a vote for the Zebralight SC51. It's hard to beat the UI and the amount of useful light you get from such a "tiny" and well built package, and it runs on the most common battery in the world!
And finally, an EagleTac T20C2 MKII, for the wide variety of drop-in modules available for it, cell choices, accessories, (diffuser lens,filters) and its overall excellent build quality. Based on what other lights I'm carrying, I can have a super bright flood with the latest XM-L, a really nice thrower, or a beautiful general use light with the nice neutral drop-in they offer. I feel the drop-ins are very reasonably priced for the value they offer. Just my .02 cents. 🙂