I dont know if u guys know but the Eden slim PC's come with a built in DC-DC ATX converter inside the box.
All you would need is to have REGULATED 12V input to it.
And wth the 800mhz CPU i assume it would do pretty good for dvd, divx, mp3, gps etc...........
and it's only $200. Can't beat that.
Just a suggestion.
Now all we need is for someone with electronics knowledge to build something that would accept 7-16V and output regulated 12V@5A =)
read more about it on this thread =)
GET EDEN BOARDS HERE! (and other cool shite)