full monitor where radio is

[trashguy]

im about to install my flip out monitor from my old truck.id much rather prefer to put a full monitor where the radio is and a head unit where onstar is. i see a few of you have done this,has anyone done this themself ? im trying to figure what size monitor would fit best there?
id rather not see the monitor bezel,just have the dash piece over the screen, so as much of the screen as possible is visible.