Suprised no-one's mentioned the Breitling aerospace which of course was designed by Breitling in consultation with pilots. It's titanium and very light and quite distinctive. It has several features all of which I use. I've had mine ten years and it still looks like new.
The downsides are that too many pilots have on now, so they're far from unique and although it keeps pretty good time, it wasn't as accurate at my RAF issue Seiko. I had to give mine back when I left. The RAF is the only employer in the world who takes your watch off you when you retire!