Yeah the G-Force isn't very cheap. I'm sure the G-major would be enough for most people. I wanted the Force cuz I'm kind of a knob freak and wanted to route my effects any way I could possibly imagine, and I also wanted the Intelligent Pitch.
I got all my rig at once this year. I was tired of buying 'intermediate' gear and decided to work extra hard a few months to buy my "perfect" rig.
The only thing I planned on and couldn't manage to buy yet was the Midi controller, the Axess Electronics FX1. Right now I'm using Behringer's FCB1010 as a temporary solution to control both the G-Force and the Mark IV (with the help of an Axess Electronics CFX-4).
I don't think there is such a thing as a 'final' or "perfect" rig, we're constantly trying to improve it as GASing musicians we are. I am real happy with mine though. It works for me so I can recommend it based on my experience.
So do you use your mark IV for your heavy tones, like distortion. Then the G-Force for just delay and other effects?