As my travel budget's highest expense is fuel, I try to keep everything else inexpensive, simple (KISS) and widely available and used as well as supported (not only by manufacturer but also users).
As a result, I use a Garmin GPS (modified StreetPilot 320c - alarm is set for proximity to local repeaters), with Garmin software (Mapsource, nRoute [no longer supported but easy to use], Basemap for 3D mapping) as well as
www.miscjunk.org and
www.gpsdepot.com for free topography maps (Garmin compatible of course) for all of Western Canada and USA. I was fortunate enough to get a freebie topo maps set of Mexico from a friend in Mexico that has most streets and trails.
This set up along with a Jeniko Netbook tray ($40), makes for a simple easy and very flexible set up. I found 12V aux plug adapters for all my electrical apps (Acer Aspire One, camera battery charger, etc.) so my inverter is along for just in case.
Acer has all my maps, music, videos, pdf manuals, etc. on it as well as making phone calls through it and chats, I have a comm centre! :costumed-smiley-007