I've installed a pc into my FJ as well as the last few vehicles I've owned, beginning with a lexus about 7 or so years ago.
As far as lcd screens you can go with a flip out 7" touchscreen or a double din mount 6.5" lcd touchscreen.
I went with a 7" flip out so I would still have a radio and dvd player as well as amplifier to power the speakers. That option made the most sense to me since I wanted an FM radio and dvd player easily accessible.
If you don't want a head unit with an amp and radio the double din lcd probably makes the most sense.
Here's a pic of my install in progress.
BTW- I wouldn't recommend the flip out LCD I have. The quality is subpar compared to a xenarc 7" lcd I owned.
Let me know if you have any more questions.
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