I have the Verizon/Casio G'ZOne Type V, and I really like it- durable, waterproof(I've taken pictures underwater with it), large enough to hold and use comfortably, and its just a badass looking phone. Unfortunately, after having it about a year and half, I'm having issues with poor recetption and will need to replace it soon. Apparently they can design a phone that can handle being repeatedly dropped on concrete and abused in all kinds of ways, but they don't want it to last more than a year or 2 so they can sell you a new phone.

Despite the short lifespan, I really like knowing that my phone isn't going to break in the field from rough conditions, so I'm leaning towards buying the latest version, the G'Zone Boulder. I don't like the appearance or feel as much, but it has some features the first one didn't, most importantly to me is the removable memory card, since transferring pictures through the verizon webpage is a tedious process involving many steps. It also adds a digital compass and has the same ruggedized features as previous versions, though I have no personal experience with its durability. It can use the VZ navigator service if you're willing to pay for it. Apparently the voice quality is less than many phones, personally I'm willing to make that trade-off.

Left: Old Type-V Right: G'zOne Boulder