Nobody can tell you which model IWC to purchase. That comes down to your personal choice. Any dealer listed here is an approved dealer and can be trusted. Most dealers get their watches from the same factories so the watch will be exactly the same.
One thing you can do, is once you make up your mind on the model, email Hont. He will source the watch for you and do QC. Many if not most dealers just have your watch drop shipped to you from the factory and they never actually see the watch. Hont will get the watch, quality check it, and then send it to you.