Any of the above. Just looking to pick up another 1 or 2. So far I have the boxer clone, pulse, capo, pico squeeze (on the way) , and s-rabbit styled (fasttech, don't know what its supposed to be a clone of, on the way). Single battery is a must for portability.
The next question is if you have a preference on materials.
I'll try to give you an idea of what I mean:
Therion BF - DNA 75/75C around $120,
SV mods - MOSFET, custom, stabilized wood, sterling silver internals, somewhere around $360 - $400
L'il Pinch - mech, stabilized wood, copper internals, $300 - $400
Pico Squeeze - mosfet-ish kinda thing, $16.90 at FT
Asmodus Luna - same idea as Pico Squeeze, $ 99 for regular ones, $129 for hand picked ones.
Worth mentioning are the Coppervape v1, some REO (prices dropped quite a bit in the last year unless they are being sold with a Nuppin RDA)
For something to knock around and not break a major blood vessel if lost or dropped in a ravine or a lake, nothing beats a Pico squeeze.
P.S. Keep an eye on the classifieds, good deals pop up once in a while.
P.P.S my bad, the SV mods have fine (pure) silver internals and hit like a runaway freight train with the right built.