I know what you mean. I bought my new nav unit off ebay. It only took two weeks and it broke. The seller was really good about it and replaced it. The best thing I can say is read there feedback if you go that route And buy a brand new one. There are a few seller that sell them new on there and thats about the going price for them, I think. It seemed like the used ones go for around 600. Here is what I did. The kids like this set up better. They had a hard time viewing the head unit dvd in the last truck.
Click on the pictures for a larger view.
DVDs, both head units have built in dvd players that interlink with each other and have game hook ups.