Seiko Prospex Kinetic GMT. These tough love "auto quartz" movements can't be manually wound, which means you actually have to wear them to keep 'em charged. But they'll reward you for it with a 6-month power reserve. This movement also has a GMT function, which makes it one of the more interesting Seiko divers. I also love the sneaky placement of the date window between 4 and 5.
At 51.5 mm lug-to-lug, 15.5 mm thickness and weighing 225 grams, your wrist will get a workout.
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