I spoke to the US importer and was told the 450/400s were just coming out, and that they would be in relatively short supply for a while. I went with a Krieghoff in the 450-400 3" a few months ago when they first came out, and have been extremely pleased with the resulting gun. They sell for about $1500 more than the price you list, but I am happier with a SXS in this caliber than an O/U and while I have no doubt that Zoli builds a good product, the Kriege has been around in the configuration for a while and it is simply a new caliber, not a whole new product. The Zoli has not been produced in anything larger than a 9.3X74R.

In the end, its no doubt just personal choice. Dave