how is their nylon sheath? i have their leather for my wave and its very nice...
I think there are a couple of threads in the Leatherman forum here comparing leather v nylon - might be worth having a look.
The leather sheath for the Charge is actually nicer than the Wave sheath, the leather's thicker and it seems a bit better made IMO.
The nylon sheaths are OK, many prefer them to the leather in fact. Myself, I use a leather sheath as it seems a bit more robust.
Either will do the job though, so personally I'd go for the best deal and I reckon you'll be happy with whichever sheath you happen to get.