Small, low power for carputer

I am after a small low power computer to incorporate into my car (BMW
E39) (and run linux of course).

Requirements are:

* low power.
* small (needs to fit in a small space in the boot.
* vga out (BMW video input is RGB with sync on green (RGsB), which
seemingly can be easily generated from VGA from  my research on the
net.
* USB host (to utilise a converter one can buy to interface BMW iBus
to the computer)
* inbuilt or easily incorporated wifi, eg linux compatible mini-pci
wifi card available (so I can sync all my music when it comes home)

Desirable if possible:

* 3G internet
* GPS easily available

Thoughts are, perhaps,

* running android_x86 if it can be run entirely from keyboard input
(iBus interface converts the buttons on the dash into keypresses).
* unknown is whether android_x86 has drivers for popular 3rd party GPS modules?
* I could retire my mythtv frontend, an acer aspire revo, which has an
external power brick, but the power brick tells me it outputs 19v,
which won't be available in the car.

Also there are a lot of nice ARM machines around like the Beagleboard,
but none seem to have a video out that might be convertible to RGsB -
they all seem to have HDMI/DVI.

I am kinda chasing my tail looking at various options, and would
appreciate any pointers!

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