Most of the "newer" units are made strictly for "non-gearheads". Not a put down but I think that most of the people on this site are looking for a little more out of their GPSs then the average driver. Your best (and cheapest) option, believe it or not, may be to look at some of the "older" models (the ones before this new crop of touch screen interfaces) as they seem to have more in the way of off-road useability. Most of the new units are "Input an address and I'll route you there" type of equipment and don't support topos, off road routes (trails, etc.).
I currently use a Garmin V which is a bit older (and like under $200 even new on eBay) and I hook it to my laptop for larger screen/color use.
Hit up the Garmin site and look at the comparo listings to see what handles off road stuff better.
(PS LOVE all the fingerprints on the last photo!
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My pics!!'03 Rennie w/all Tupperware
Custom Roof Basket
Mopar Tubular Brush Guard
Garmin GPS V & Laptop w/Nav software
RAM products laptop mount
Maglite w/mount
Rear cargo bay tool cabinet
AllJs Rear Shelf
Rear receiver
250k miles!
LOST #CR051230