I'm not quite as far down the rabbit hole as some of those light geeks but I do know that Mountain Electronics has some great stuff. They make some great custom electronics and offer a good array of other, more value oriented stuff.

Also, just as an FYI right now Amazon has a screaming deal on the incan Surefire 6P! Just $28 plus shipping for a grand total of around $35. Granted, to update it with an LED engine will be a few more bucks but the basic body/host is fantastic. I have two of them myself, one with a Malkoff M61L and another waiting on the arrival of a Malkoff M61WL.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman