A while ago I came to the conclusion that a Casio G-Shock is the best watch. They don't have to be expensive, a good one will sync the time multiple times a day, so it's always accurate. A good one also has small solar panels in the watch face, so the battery will never be empty, and all of them are really build to last.
From a pure functional perspective I think it's the best watch ever made. It basically tells you the correct time, always.
I keep one until the battery dies. Then I replace the battery with a second rechargeable lithium and a new watch band. By the next time the next battery goes dead, the case is shot, too.
Make absolutely sure that you follow the battery replacement directions carefully, reading the directions fully BEFORE attempting it. There are very tiny parts that can drop out and easily lost.