Airbox
We have an Airbox Foresight in our Sportcruiser and on the whole we are very happy with it. I recently went via Holland to eastern Germany by myself and it helped a lot.
There is nothing like seeing the map all the time and getting the airspace warnings.
We got one fairly early and the software has had to catch up a lot, but it has come on in leaps and bounds. if it keeps improving as it has done it is going to be hard to beat. We have a dock that takes a 296/495/Aera and I think for planning routes that is still the primary GPS. We tend to use the Airbox for situational awareness and airspace alarms although its well capable of being your only GPS even if the flight planning software is a bit weak at present. But this is getting better all the time.
Pete