Hey,
in my eyes, the best rig on the marked is the PRO Stedicam. The vest is extreamly comfortable,
the arm (I have the medium sized arm up to 63Lbs.) is perfect and the sled and gimbal too.
But don't forget the Tiffen Ultra Cine2. In fact it is pretty expencive, but it is one of the most professional
rig for heavy cameras...
But I am for the PRO GPI ;-)
Be safe
Henry