I'd go with the 7550e, as it has a numeric keypad. The radios are all pretty much push-to-talk once you have them programmed, and you can do it with software that makes it very simple. You can learn all the direct entry features as you go along. They all seem like very good radios, Motorola doesn't really make junk. It will last a very long time and take a beating. I will note that the 7580e is not a GMRS radio, so there's that.