One thing I don't like about most G-Shocks is the buttons on the stopwatch feature. The only good one I've found is the DW5600, the classic. It has the start/stop button on the upper right side, and the reset button is on the left in the top recessed button.
Most G-Shocks have the start/stop on the lower right, and the reset on the upper right. Last weekend I went hiking and was using a DW6900. Not once but *twice* I accidentally reset the stopwatch back to zero after pausing it. Grrrr!
With the DW5600, even if you hit the wrong button on the right side, the worst you will do is activate the Illuminator light.
The DW-290 classic sports watch has the same buttons as the DW5600, which makes it another good one for stopwatch use.