Casio M5610U with a metal mod I picked up for $99 and I love it! Pick up and go with never a care for durability or accuracy. World time across 5 presets, that you can swap back and forth with your home time at a press of buttons, solar powered, and radio receiving for auto updating of time and date.
What's your cheapest watch in your collection?
I have a casio 5000 that I payed $30 for and I put it in for My worst of days when I am doing things that are very likely to damage a watch. 3 years later it is still in perfect condition other than a few scratches on the plastic from things. I am pretty sure my wrist would break before that watch does.