Well after getting lost in the wilds of Oxford trying to get to Brookville I think a GPS would come in handy for other things just besides the geo-caching.

I have a base-model Garmin eTrex that I got for $99 and I leave it in the car mostly but take it with me when traveling. The rubber edge on the unit has allowed me to jam it between dashboard and windshield in most rental cars I've had. Makes a nice compass (mostly), and what I have done is to set waypoints that I wanted to return to (like hotels, train stations) so that I could more easily indulge wandering/exploring on secondary roads. Plus, You can set your watch to it and it is handy for those "Are we really doing 186MPH?" moments.