For sale is my Carvin BX1600. It was purchased in May, has been gigged 7 times, and been kept well protected in my rack. Perfect condition. It will also come with the Carvin FS 22 footswitch I purchased with it. Its an incredible amp, but I'm downsizing my rig. I paid $664 for both, selling for $500 plus actual shipping from San Antonio, Texas.
Haha, how ironic...a Genz is exactly what I downsized to, a Shuttle 9.0. If I didn't already have that I probably would have taken you up on the offer. I just wouldn't have a need for a 12.0 right now, but thanks for the offer though.
Good luck on the sale. Those Genz Benz are fantastic amps, I wouldn't be surprised if you sold it pretty fast.