I spent the last month planning shifting to the Nikon system, specifically the D800/D800E, and put together a full list of my choices for rigging the camera for heavy professional use.
These notes were put on my blog, as a guide for the newbie wanting to know how to properly rig a full DSLR system.
Here's the main menu: http://wolfcrow.com/blog/master-guide-to-rigging-a-nikon-d800-or-d800e-part-12/
Since then, I'm considering the BM Cinema camera. The guide tries to cover everything under the sun, but I'm sure I've left out quite a few important requirements. Remember - it's just a primer.
Suggestions for improvements are definitely welcome and appreciated.