Good choices Forest.
You can't talk about rugged simplicity coupled with aesthetics without mentioning the Surefire 6P Original. They are a work of art, especially when in brand new condition. The knurling, the glossy black, the venerable Z41 tailcap - it's perfect.
What drop in you running cland?
Anything Malkoff, but my favorite is the M61L 219. I have a couple of M61 and M61LLL 219, as well a M31 kicking around as well.