I had a GPS with notebook. Its nice at first but a pain later on. I prefer a small handheld GPS you can use in the car with a power adapter or just batteries. If you want to download the data for analysis then get one that has track log capabilities.
I currently have a Garmin Oregon 400T with the street navigation software added to it. I can use it for navigation on-road and when off-road in the Jeep it has topographic maps and tracking as well. I did have a Garmin E-Trex Legend that was great for a basic GPS. It finally gave up the ghost after being abused for 5 years that is why I bought the Oregon.
what is it you want the GPS for?