Steve,

 I would recommend upgrading your cell phone to one that will run Windows Mobile and has a bright daylight screen.  That way you will always have it with you and at your fingertips.  If you later add Farm Site & Site-Mate you would benefit from the GPS on the Juno, but for now you don't need it with your current software.  I purchased the Juno and really like it, but wouldn't want to carry it with me all of the time.  Having the software on my phone is really handy.