The Leupold's have received good reviews; unfortunately I have no experience with them and cannot comment appropriately. Leupold's lifetime warranty and customer service centre in Alberta make them an attractive option, if the service should ever be needed. Like that they are Bak-4 glass.
The Minox are very good glass, and if I had to replace my Swarovski SLC's, I have thought that this would be a less expensive option for very good glass, that is often overlooked by many. Also very lightweight. Would have to look at the specs to see if they are lighter than the Leupold's.
The Sig's are a nice option w/ the rangefinder...you need to determine if that is a priority for you.