I've found a great deal on a lightly used Super RI at <$700.

About the same price as the cheaper SF Supers. I was hoping that an attenuator would allow me to play the amp at higher levels, 5-6+, and not drive everyone else out of the house while practicing. I thought that an attenuator would bring the volume down while retaining the break up, saturation etc... I must admit that I hadn't considered that the the older Supers would be easier to mod.