The best thing I've been able to find is the Nuvi 500 which (supposedly) offers street navigation for car use, as well as Geocaching features for off-road use.
It appears to let you load GSAK files directly, and seems to show you the cache information, as well as the extended description, last few finds, etc... and lets you mark it as found or not, yada yada.
I have never laid hands (or eyes, for that matter) on one in real life, and wonder if others are using the particular model, and if they're satisfied with it.
Are there other combo units available that perform the same duties in a better, more effective way?
Thanks in advance for any tips/pointers!