My family and I are brand new to Geocaching. We are looking to purchase a GPS. We want one that is advanced enough to last us a few years. I've whittled my choices down to 2 units on Amazon: the Garmin E-Trex Vista and the GPS V. Help! Which one of these 2 is the best for geocaching or is there something else out there? I'll shut up now and let the experts speak...thanks in advance.