I personally would go with the CL1H v4 with a Malkoff M60. This is a great combo - you get a host that can hold a number of battery combination's, very upgradeable (think MC-E soon), and with the M60, a ton of usable light designed by one of the best builders here on CPF. There will be no "low" with this combo - which doesn't seem to be a need of yours while taking a night walk in the pitch black. Somebody else will have to tell you about using an 18650 with the Malkoff. I just don't know...