rig shots, panning, chase cars....they all take photos that at first glance may be similiar, but there are a lot of differences in them, and they each have their benefits depending on what you are trying to show.
rig shots are very good for wide angle detailed shots. everything is incredibly crisp and you are able to get angles that you just cant get with panning and a chase car. Also it allows you access to locations that you simply cannot use a chase car in.
The setup I am using cost around $600 including the boom pieces itself (aluminum). It consists of all Manfrotto components. The camera is held onto the boom by 2 super clamps, friction Magic Arm, and the camera mount.