I like watches a lot. I own a few divers and chronographs as well as a couple Gshocks. I have bought and sold a lot of watches on Watchuseek.
Smcclown: The Mudman is a great all around watch. I have taken mine hiking and swimming. The buttons are harder than most Gs to push. You can make them easier by taking the rubber/plastic bezel off and putting it in boiling water for a few minutes. It softens them up nicely. You can also use the Nato or Zulu straps on a G. You will need the adapters to use them. I think they sell them at countycomm.com.
Styx or anyone interested: If you are looking for a nice automatic that you can use outdoors look at Seikos line of auto divers. The most popular are the 007(nothing to do with the movies), 009, orange and black monsters. You can find them under $200 new or from $100-200 used. Most of the divers are ISO rated to 200m. I dont remember what specific ISO number but it states that the watch has to perform to 125% of it rating for a specific amount of time. They are good to go in the water. Seiko makes great products. Most people see Seiko in the US as just a cheap watch. Seiko makes watches as good as or better than most Swiss watches although the Swiss fans will never admit it. With any auto you need to be careful with it. Any real hard knocks can damage it. Regular bumps and scrapes will not hurt it. I wear my autos to do everything from hiking and swimming in rivers and lakes to shooting ARs and various handguns.
If you do not want an auto, Seiko makes quartz and Kinetic divers. Kinetic is different from automatic. Autos use a rotor turning to wind a spring which powers the watch. Kinetic used a rotor to charge a cap. to power a quartz watch.
If you want more info on watches or where to get new or used ones, PM me.