I've had a few JVC head units in my time. AVX1, AVX2 those have the 3.5" full color displays and also plays DVD. You can add an external display. I sold the AVX1 when I got my AVX2, but my son is still to this day using the AVX2 in his xB. I took his newer head unit and put in my xB. I am not one for video in a car.
JVC makes some quality head units, but they also make some low-end Walmart junk too, so you need to read up on the various models and actually get one that has good reviews. A good place to get reviews and check out various models is Crutchfield! They are a bit expensive to buy from but once you select a model, you can search to find it cheaper elsewhere.