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I'm currently leaning towards either a EBY701 or 699GL preassembled double din units. Looking at the picture of the unit, I see the plugs for HDMI, RCA, power and the last plug on the right, which I'm not sure what it is.
http://www.bybyte.com/highslide/imag...FR669-R640.jpg
or
http://www.bybyte.com/highslide/imag...DFR701_R_L.jpg
So what if I just want to run VGA straight from the PC? I'm still kinda new at this but I was expecting to see a VGA plug/port on the back of the screen.
that last plug that you are not sure of would be for the vga, and usb connections-- the closest that i can compare it to would be something like a s-video cable, but the pins are different.
any monitor that you get should include the cable that connects to that port(i haven't seen them be sold separately anywhere)
How far can you go with VGA before the quality starts dropping dramatically?
it really depends on the amount of interference in your car-- i know that a common install location is the trunk, and i rarely see posts asking what to do to get riff of interferance in the screen, so i would have to assume that 99% of installs, 15-20ft of vga cable is fine.
a quick google:
What is the maximum length of cable for a DVI and VGA?
DVI
Using copper cable it would appear that the limits are approximately 1600x1200@60Hz to one meter and 1024x768@60Hz to 9 meters with appropriate signal strength from the graphics adapter. repeater may be required for longer lengths and there are "Fiber-Optic/electrical-to-light-to-electrical cables available that permit lengths to 100's of meters--see below