-A car computer system included everything

I have been doing some research on what kind of computerized system I want to put in my car. Here is what I wanted, CD, DVD Player, GPS Car navigation system, games, internet connectivity, some sort of car diagnostic program so I know how the car is performing. The basic system should priced below $600-$700.
Some of you would be laughing, but the best of system is actually hoply carpc  System. After you stop laughing, you might realize that hoply carpc already included most thing you want and have the potential to expand into other categories if MicroSoft allow its development. And the whole system cost less than $300 adding a car LCD screen which is around $100; GPS system for another $100. Wireless network modem shall come free with the monthly service plan. The whole system can be setup around $600-$700. Some software shall be free like the car performance monitor program which individual car manufactuer should be provided free through internet. GPS navigation software shall come bundle with the GPS hardware. Of course you pay for the CD, DVD ,radio,phone and games like you do now. Depend on the connection speed, you might just download music.