I was like you a few years ago, then I just realized it was a waste of money. Just get a nice cell phone capable of doing heavy data and you will be set. Most likely all the features you want in a carputer you can do in the newest cell phones, if you want to listen to music, then just plug in the phone in the aux or a usb into the reader.
Think about it, if you don't know how to build one, you will have to buy one already built, that alone is at least $1000 (for a cheap one) $2000 for a nice one, then the install; another $200. And then just wait for someone to break into your car and bye bye money.
Think about it, if you don't know how to build one, you will have to buy one already built, that alone is at least $1000 (for a cheap one) $2000 for a nice one, then the install; another $200. And then just wait for someone to break into your car and bye bye money.