Hey CJC...I'm fairly new here to the portal also! Been lurking for awhile...allow myself to introduce...er...a...myself...
Anyway, I've been in the same boat. I've been toying with the idea of either one of these.
http://phandroid.com/2010/11/01/vie...pad-10-us-pricing-and-availability-announced/
It's way out of my price range right now and still a little on the bleeding edge of technology BUT, when you think about it, these will do just about everything....music, movies, camera, video recorder, Broadband, WiFi, video Skype on the road, bluetooth (to you car deck or hardwire it straight to an amp...stealthy, no stereo to steal), GPS that runs on Windows 7 for topos, USB for an external GPS antenna, or boot up Android GPS google maps.
The only tricky part would be mounting either one of these in a vehicle. There doesn't seem to be a lot of options out there right now. My thought was to put it on a Ram mount or a goose neck style microphone type mount with some sort of craddle. You can move it around, take it with you when your not in the vehicle. It could be worth the wait when the bugs are worked out and the price drops. The big question is how much abuse can these things take?!
If your looking for a straight forward GPS that's bulletproof then you might consider something like this
http://www.expertgps.com/gps-receivers/Garmin-GPSMAP-496.asp. It's designed more for aviation but it appears that you can also load Topo maps on it also.
It seems there should be a cheaper solution like a TomTom that you could load Topo Maps onto but I haven't found one to settle on either.
That probably didn't help at all did it?!