Where do you live, and where do you cache? If Garmin's "try it" is giving you problems, I can post some sample screenshots from Mapsource showing those areas you're interested in, in both Topo and City Navigator, and you can use those to help you decide.
I live in northwest GA and we do our geocaching near there, of course. We RV to Colorado/New Mexico in Spring and or summer and will geocache along the way and while we are there.
Example: Some friends and I went to GCD30B in Eastern Alabama (you can see Flagpole Mountain from my house in Georgia) yesterday. We found the cache OK, which is on the Pinhoti Trail, but my Legend HCx wanted to send me on a 16 mile trip back through Georgia, over into Alabama and back again even though we were at the trailhead and only a couple of miles from the cache. All because the county road we we on wasn't included on the base map.
Anyway, the screen shots would be appreciated! Thanks!