I have the same lights for my EDC...
You should consider getting the 1xAA body for your X and even getting a 14500 for it as well - it's a seriously powerful little gem in that config. And the AA^2 tube makes a great spare battery container for your bag. Even run on 1xNiMh, I think the Quark is just as, if not more, powerful as the ZL... Always thought ZL was fibbing on that spec.
I find myself EDCing the Quark more often since i just happen to like cylindrical clickies.
Cool :thumbsup:
I might start doing lego stuff but for now it fills the 2xAA gap quite well. Even in my dress pants right here at work I dont even notice the size of the quark. I still like the form factor, UI, and tint of the ZL so for 1X AA I prefer it, but I may try the quark out in 1x eventually. I dont have any Li-ion yet but may try 14500 sometime, but for now eneloops for me. Thanks for the suggestions.