Are you going to use these, and in what capacity (carrying around, desk pen, etc). I personally have not been impressed with the Tibaldi's in any iteration I've seen (don't like the converter mechanism which, incidentally, they have tried to set up with a subtle mechanical click in order to be reminiscent of a manual wind watch). I just feel that, for the price, there are a plethora of pens I'd rather own. The Dupont is a reliable product--if you like the styling, it's a great limited edition. Not sure if that one has developed the following that will drive its value upwards (like the Taj or the Gold dust). The Cd'A is nice, but certainly a bit difficult as a functional pen. I might lean toward this one if the pen is more of a desk/display type.