Are you going down the exotic skin route, Christian? Alligator, Croc, Ostrich, etc, or going for Calf?
I can recommend Camille Fournet to get a custom made strap, to your spec, and especially as it's your daily wearer, you can spec the rubber lining to avoid sweat stains and premature wear.
You're going to be looking at around £170 or so for an Alligator, but, to get the custom treatment, it's worth it.