I've been using Garmin's topos, for the U.S. and Canada for a few years. They're 1:100K, and relatively inexpensive,and easy to use.
Someone gave me Nat. Geo's topo program for xmas, and I'm pulled in both directions by it. It offers 1:24K maps, with much finer details, but it surprisingly lacks a lot of street names that Garmin's offer. It's also a far more expensive system, if you travel beyond a single state or two.
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