Yup, I understand completely. Big screen is the way to go. I have a Garmin GPSMap 76CSx but I use the laptop paired with a Garmin GPS 20x whenever possible instead. I'm running both Garmin Mobile PC or Garmin nRoute on the laptop, depending on what I'm doing. I find Mobile PC better for vehicle navigation on roads but I find nRoute better for off road and marine applications. Actually, Mobile PC won't display marine charts correctly so I have to use nRoute for that.
You can preview Garmin's US topo maps at:
http://www8.garmin.com/cgi-bin/mapge...&rz=0&k=1&sc=1
The viewer there is limited but at least you can search an area you know well to see if the data you would want is there. It looks way better on the laptop screen. The attached images are screen shots of nRoute on my computer. The urban one shows a red triangle for my location with my direction of travel up, the other shows a North up view of a hilly area about an hour's drive north (both at the same scale).