Recently my gaming pc's CPU and MOBO died

. Ive been looking for a temporary replacement to use for school and work until i have enough money for a new high-end mobo/cpu. I eventually intend to install a car pc. So after some research, I've found a solution that could possibly kill two birds with one stone.
The ASRock ION 330 NVIDIA ION
http://www.asrock.com/nettop/spec/ION%20330.asp
It meets all my needs for temporary home computing ie: word processing email checking and music listening. Its inexpensive and its been getting pretty good reviews. But, (and i guess here's where my question comes in) Can this system run in a car. It would be nice to know that this is possible before i commit to this purchase.
I know nothing about power when dealing with cars. ASRocks website says the system runs off of 19v so couldn't CarNetix P2140 and the "Power your laptop with Goce from mp3car" vimeo tutorials solve the power issue?
Secondly audio, although it has 5.1 out its digital. I dont know what the standards are for amps now but as far as i can find digital amps are in the thousands of dollars. If i used the stereo out (3.5 mm jack) and converted it to rca how would sound quality be? What do head units output in stereo?
Thanks for all help....and sorry for all the n00b questions