Does your GPS unit have a simple, one-touch, Go Home button? Mine does and I love it when traveling. Makes the trip home easy to plan.
But here's a thought for you. Have you considered how easy it would be for a thief to find your house with this button? If a bad-guy gets your car keys, thus your car, there's a good chance you have a home key on the same key ring. So he gets the car started, pushes your Go Home button, follows the route and there he is, right at your front door with YOUR keys.
So my advice is to chart your Go Home button to a very nearby place – but not your house. Heck, just a few houses down would be enough to keep a car key stealing thief from finding your exact location.
There are a ton of websites out there to help you choose a GPS if you don't have one yet. I do recommend having one in your off road rig (and your RV if you play with big toys). It's a very helpful tool and be most useful in an emergency as well – you can direct in emergency folks with way points (lats and longs).
You can read a bit more on my website here: http://www.delalbright.com/Products/products_gps.htm