Car PC

I have had Double DIN decks in the past with DVD playback, looking to take it to the next level with a Car PC. Anyone have experience with this, I would love to chat. Looking at removing the factory HU and putting touch screen in place. I currently have the HK 9 speaker setup. Anyone know if it's a external amp for the speakers, where its located, and if you could use that alongside the Car PC or would i have to add a 4 channel. Any input appreciated. Thanks

The HK amp is under the passenger seat. I am thinking about this too. I was thinking an INE-Z928HD + Nexus 7 would fit in the dash. The INE would serve the main audio/dvd functions and the Nexus would serve for data logging, maybe run Torque type applications, etc. They both should just about fit stacked.