okay so i just bought a new head unit (alpine w200). it has a beautiful touchscreen on it, and a/v inputs on the back. now i know using these reduces the quality of the pc, but is it really that bad? anyway, since this will obviously rule out the touchscreen on the unit, i would need some kind of rotary navigator and some good front end software that works well with it. also, this front end software would need to have functionality to view engine diagnostics (OBD II) because this is the reason i would be getting a car pc in the first place.
soooooooo heres my questions:
--is the resolution that bad?
--is there some kind of software i can use to adjust the screen position? (since thats usually done through the monitor, i won't have that function)
--what good front end software and rotary navigator that work well together? (must have engine diagnostic functionality, and of coarse, look good

)
any ideas or experience or anything?