fenix p1d
lol, im not sure whether you'd wanna go into the Ti/custom area, its not good for your pocket. =P
Anyway, I haven't eyed on much good ultra compact 1xCR123 lights myself, but i do have a 1xCR2 in mind.
I just clicked on the link you are eyeing up. Go for it. I have had the polished version for about 3 weeks now and I take it everywhere. It is smaller than the EZCR2
The 4 mm you save in length cost you 70 lumens and $300 compared to a P1D
These are the smallest I am aware of (and the cheapest)... 6 bucks for 66mm total length. They should be one of the lightest too with a plastic reflector and front lens.
DX-SKU:2097
DX-SKU:2083
But they are significantly inferior to other cree-based lights in just about every other way I can think of.... (brightness, efficiency, quality...etc...). As with any low$$$ DX purchase, expect to spend some time tweeking and tuning to get light out of them.