Guys, if I narrow down my first GShock to Mudman, Gulfman, Riseman and Frogman. Which is a better choice you think and where can I read about the different specifications these models can do. Besides different designs, what should I be looking for? And are all these 4 models Made in Japan? I kinda like the Mudman and Gulfman for their design as compared to Riseman and Frogman. Thank you in advance.