Ian, I love that you are talking about transitioning to HD. With so many members complaining about the features on the amazing AF100, it's nice to remember that most paying clients are still satisfied with well produced DVX footage, let alone something shot on the HVX.
I have to add that AF100 is not designed to be a competitor of the HMC-150. It is supposed to reach for the Canon 5D market (low budget film production). HMC-150 is a typical ENG unit but AF-100 is more of an off field camera. It requires prep before shooting.
The new AG-HMC80 might be a replacement for HMC-150, Or the HMC-40