Thanks for the comments guys.
Tom:
The Rosenthal was the only one I have seen for sale and it was about $600.
I have seen the Allach for sale before. Tom J had one on his site and he was asking $1,995. I got this from Dennis off his web site for a bit less than that.
I would say that the Allach is at least three times the price of a Rosenthal (the SS mystique at work, I guess), and I have absolutely no idea what a coloured version of the Allach would go for? Twice or three times what the white one is worth? I do not know.
John