I'm looking for a GPS unit for my truck. I have fondled some of the Tom Tom's, the Garmin Nuvi's and such. They're very nice for routing, but they lack topographical maps, off road trails, marking waypoints off the road and things like that from what i could tell.

A large chunk of my driving will be on road naturally, but i want to be able to see trails throughout the state as well as mark camp sites, shooting spots, good turn outs for my dogs and stuff like that.

What should i be looking at here?