A friend just told me that a guy he knows is selling his SWR for $400. It is either a Redhead or a Super Redhead, so either way I'm getting a great deal. I haven't seen it yet, but I know it's in great shape because my friend told me. Besides the power, are there any major differences in the two? If it is the older Redhead, should I just wait and get a different amp since there is an upgraded version?