Personally, I am a big fan of myTopo's Terrain Navigator. Most SAR teams in the Pacific Northwest use it. It's simple to use. National Geo. has a fine topo program too. Water proof paper adds longevity.

Concur with all the comments about the age of data on topo maps. That said, my local butte hasn't move in 4 million years and the topo data is right on.

The Delorme Gasetters are great and I have one in all my cars.

Blake
www.outdoorquest.biz