Hey Snook check out this forum first.
http://www.cinema5d.com/viewforum.php?f=21 There are a million rigs, it really comes down to what you need to do with them. Factors like weight size and usability have a great impact. It might be better to start simple and see how it works. Things are changing very fast in the DSLR motion market by the end of the year most of the features in this kind of big rig will not be as necessary. New cameras, focusing and viewing products are getting better and cheaper.
Dennis
