My honest opinion:
Don't get the ITPS or that PW200. (If you've already bought them, then what's the point of asking in this thread?)
Get yourself either an Opus, or a Carnetix CNX-P1260 plus Morex 60W DC-DC power supply (either separately, or inside a Mini-ITX case from Morex/Travla).
Either of these options are MUCH better than the ITPS + whatever combination, especially if you think you might EVER want to use your carputer with the engine off, or will want to start the engine with the computer on.
I personally prefer the Xenarc monitors, as they are built better, and there is much less glare from them than the Lilliput, and the touchscreen is better.
The only other thing you need is a GPS receiver.