I actually very seldom use my GPS when out hunting except for the private land I might be close to but usually that isn't even a factor where I hunt.
For general ground surface maps that do show private I like the Forest Service and BLM maps that each put out. Neither one of them is what I would call a topo but they suit my purpose.
Here is a online source where you can purchase the Forest Service or BLM maps.
http://plicmapcenter.org/