Assuming your sig is listing your current gear... why do you need a new camera?
And why do you need a magic lantern?
Just curious. You seem to have adequate gear to perform most photographic functions. At least, the last thing I would think you would need is a new body. Maybe a different lens or lighting, but you have two fabulous cameras. Switching to a 1dII from a 7d is a huge downgrade. Switching to a 1dIII from a 7d is fairly lateral but a slight upgrade. Both offer different advantages.
I think your focus might be misplaced, or were you just joking?