Momrocks, just saw this thread, better late with a reply than never, eh?
I have used NG TOPO for over a year and wouldn't trade it for anything. The initial cost is high but what it gives you is great. I've got it on my laptop, interface with the GPS to show where you are in real time on TOPO. The map follows you wherever you go and if you want leaves a track of where you have been.
You can draw the route you want to take before hand and then follow it once you're on the road, dirt/gravel/rock road preferred though.
I would really like to see the other products out there as a comparison.
07 FJ Cruiser set up for the long haul
"No matter where you go, there you are" - Buckeroo Banzai