Still working on it. I've decided to work from the inside out. That is, I need to understand SVG's native animation capability and work from there.
That said, I am leaning toward Snap at the moment, though Greensock may play a role. It seems to me that browser SVG support may be the bottleneck. Still not sure. Once I understand SVG native capacity, I will be playing with Snap.
I sure wish we were 2 years ahead of where we are now. I'll keep you posted.