They all seem to be very similiar in features, I think I need something with a relatively easy to use additional memory card feature so I can load a topo map.
If I understand correctly, you're looking for a unit with 2 memory card slots? Why would you need that? I own a Garmin Legend HCx and I've got currently 3 different maps loaded on my 4GB memory card. In any case, switching memory cards is really simple if there's absolutely no other way around it.
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