The 60cx is a much more powerful unit and will give you many more options as you learn to use it more. I have a Garmin 276C that I can move between my boat, ATV and truck. I use a 60CSx (it has an electronic compass built in) for most of my caching as it's much easier to hang onto than my other unit. I'm sure what ever one you choose that the more you use it the more familar you'll become with it's features.
As someone else said in a previous post make your house a waypoint and then walk to or from somewhere else back to the waypoint that you created. Most people don't learn to trust a GPSr until they do this type of experiment. A few years ago a friend of mine was convinced how useful a GPSr is when we're out ice fishing. We went out in a snow storm, you couldn't see 30 feet due to the blowing snow. And I drove direclt to the last spot that we'd been fishing and we had a great evening of fishing. When it was time to come off the ice we drove directly back to where we had come onto the ice. You couldn't see anything due to the blowing snow. All I did was follow the same trail back into the shore that I'd take out.