Seiko SKX dive watches. Incredibly durable and robust. Plus, there's a ton of aftermarket for the Seiko watches. I have several that are pure customs, assembled from parts. For years my daily wear/beater was a Seiko SKX009. It's been covered in grease, pounded on while shooting, in general worn for almost every activity I do. In fact, I have it on right now.
The watch addiction is a dangerous thing. I could have done a lot of Rover upgrades for what I have spent in watches. If you combine it with the guns, I could probably have a reasonably nice Defender 90 by now... The current watch collection sits around 20 at the moment. Mostly mechanicals, with a couple Citizen eco-drives thrown in for good measure.
I have a Seiko kinetic, but wouldn't buy another one. They are great for someone who only has one or two watches, but in a large collection they don't get enough wrist time to keep them charged. I have to sit with mine while I watch tv and swing it back and forth to keep it charged.
If you want a don't worry about it, grab it and go timepiece, get a quartz. If you want a cool machine to wear on your wrist, go mechanical. Almost any mechanical can be regulated to keep good time, just keep in mind that every five years or so, the movement will need to be serviced to keep it in top form. I have a Rolex homage watch that keeps +/- 15 seconds a day, and it has a cheapo $9 chinese mechanical movement in it.
Watches are really cool, but nice ones are really expensive, and once you start building/modifying it can get really bad. If you have no inclination toward collecting watches and tinkering with mechanical things, stick with the Casio. Watches can be a slippery slope....