What are you mostly shooting?
I'm curious, why do you want to get the 24-105?
Also, definitely the Ninja Blade if you can afford it, the C100 doesn't have a great EVF or flip out screen. If you've got the Zacuto EVF, you should be mostly good, but it's really nice to have the Blade's sharp screen, waveforms, etc.
Especially if your in a situation where you can't have your eye glued to the Zacuto.
I'm also interested!