Well, Zacuto just made things a lot better with their new gunstock rigs for DSLRs.
The key here is not to encage with metal, keeping it light at 6.5 lbs. including camera & follow focus make it the only true portable capable of shallow DOF.
Steve Weiss, product designer, Zacuto USA
They also became much more reasonable in price, going from the $5k range down to the $2k range.
More details on Zacuto’s site.