The Chief RPA-U is what I bought after some research, having started my own thread here. $159 at PP. I also bought the matching mounting plate ($20) as well as the pipe ($60). Now, you can pocket $50 by getting a pipe of any certain length at the hardware store, but I like that the pipe is adjustable with 6" play. (Must choose something like 6"-12", or 12"-18", etc, IIRC). And besides, it looks good, and matches in finish.
The mount is excellent because the way the arm/mounts work, it's future proof, no matter if you have lens on one side, or centered. Roll, pitch, yaw are all adjustable. Directions aren't incredibly clear, but it becomes more clear after some screwing/unscrewing and experimentation.
The one thing I need to tell you is that the pipe goes into a CERTAIN side of the mounting plate (didn't know, and slightly stripped my pipe). Whatever, it's in, and it ain't going nowhere.