I am interested in getting some sort of portable ballistics calculator, but don't know much about them. I think I want something for a Palm Pilot device of some sort, but I don't know anything about them either. I would prefer a color display, but not a deal breaker. This is probably the only application I will ever use on it, so I don't need a top of the line model. I would prefer something that is ruggedized a little, and hopefully could stand a bit of rough handling. Water resistant would be good and I need to be able to read it in sunlight or darkness. Pocket sized would be nice, but it needs to be large enough to read and handle my man-hands. What do you suggest for a device and what software? Thanks.