This + geoscout + BeeLineGPS would be ideal. Geoscout with the autodownload of geocache, beelinegps with its management of them + great trip computer for analyzes tracks (ascent graph, etc) and this for the automatic teramaps and general ease of use.

Here is how I get my downloads from geocache.com; using the new pocket query, I have it sent to my gmail, which I can check on my PPC 6700 via the internet. I have to change to html view, but then I can download the file into the location, and then launch BCN and import.

Oh, and keep in mind that the primary function of Geoscout is as a geocaching program.  It is the best for managing geocaches.  The primary function of Beeline is as a GPS management program; it is the one with all the pretty GPS maps and graphs.  The primary function of BCN is as map viewing software.  Most of the BCN programing time goes into the primary function, which is making the downloading and viewing of map tiles more efficient.