a bit of detail about what you're looking for for the CarPC would help others out.
There are literally thousands of configurations for CarPCs, just like desktops or laptops.
I'd really suggest figuring out what you need first and then post up specifics.
I'd also check out the other threads in here where folks are selling their PCs. Make the effort to go to them and I'm sure you'll get results a lot faster.
Welcome to the boards btw!