I think this is the area where I have the most options. I haven't set a budget on my project (bad idea) but for the most part the cost variation is minimal except for screens and amplifiers. The screen in a car PC is basically fundamental. It acts not only as the display to your computer, but also as the interface. Here are my requirements for a screen.
- Can be fitted in my double din dash opening
- 1024x768 resolution
- usable in sunlight
Given these requirements, the options may not be so many. Here are some popular choices I've come across.
Both screens have a double DIN housing, and LED backlight for greater range of brightness. Both support resolution up to 1024x768. The 629 seems to be a little bit brighter.