Tele-Xenars actually show up regularly on eBay. When I was looking for one a while back, there suddenly appeard about 4 in the space of a few months. The first one I got was a lemon, someone trying to sell damaged goods I think (C-Trades). I returned it and found another one a few weeks later in Germany that was like new, and cheaper than what I paid for the first one.
A fantastic lens!
I'd like to find a good deal on a 40mm/f4 Super-Angulon myself.
What is the 60mm Curtagon like? I've been using a 80/2 Xenotar, but could see the use of a 60mm for slightly wider shots without being obviously wide angle.