Here are some pictures of a few watches that may work for your purposes: Breitling Crosswind Special: This is probably my favorite watch that I own.
Audemars Piguet Royal Oak Offshore: I love this watch too, got this as a gift, and don't wear it too often, but it is an awesome watch.
IWC Aquatimer: A great dive watch, I have this in Ti.
Rolex Seadweller: I don't have one of these, but if I was going to buy a Rolex, this would be the one, very clean IMO.
Rolex Daytona: Another watch I got as a gift, but don't wear too often, would work in both casual and dressy environments IMO.