get both. even if you don't use it for vaping, the vamo is incredibly convenient for building coils on. click one button and the resistance of your coil pops up on the screen, without having it attempt to fire. also good for checking battery voltage in a pinch, and it's always nice to have back-ups.
you should be able to get both from fasttech for about $60 shipped - think a vamo is about $30 and a k100 about $25
you should be able to get both from fasttech for about $60 shipped - think a vamo is about $30 and a k100 about $25