Garmin's US Topo maps are based on the USGS 1:100,000 series of maps and show the same things as those paper maps in terms of roads, streams, lakes, and contour lines. Note that these are less detailed than the common 1:24000 series.
But you can preview all the detail on the Garmin maps on their website using the 'MapViewer' at:
http://www.garmin.com/cartography
Zoom way in on a few areas with which you're familiar and use the 'More Detail' button to be sure you're seeing everything.
Sweet! thats everything i was looking for in that!.....i hear it doesnt need an unlock code or something, does this mean i can buy a used copy, or burn one?