Something to keep in mind
Game on: If your system has the appropriate inputs for a game console you can even take your Xbox, PlayStation or Nintendo on the road. You will need to get a power converter however, so you can plug the system into the vehicle's accessory plug (or cigarette lighter socket).
Don't be shocked: lounge room systems such as DVD players and non-portable games consoles usually have little or no skip protection and might find it hard to cope with the thumps and bumps of Australian roads, so be sure to mount them on a "cushion" of some sort to lessen any shocks to the system.
Avoid the splitting headache: Some people are never happy, it seems. The more options you have, the more in-car "discussions" over what system to use. One passenger wants to play a video game; another wants to watch a movie. This can be sorted satisfactorily with "multi-zone switcher" circuitry that lets different devices work at the same time. Of course, you will need more than one monitor. You will also need some headphones. Some systems now come with wireless headphones, while others (especially portable systems) have a "splitter" adapter that lets you plug two sets of headphones into the one audio-out socket.
This type of split system is essential for the driver's peace of mind and concentration and will let you listen to your favourite audio, without getting driven around the bend by endless repeats of children's cartoons or game console noises.