[CentOS] monitor config in xorg.conf

What's the smoothest way to change the monitor on a system?  I've done 
this before and, aside from the initial cold boot (after unplugging the 
old monitor and plugging in the new one), it also took restarting X 
(gnome) several times to get the (new) monitor tuned correctly.

The "new" (actually a bit old) monitor is an Acer P191W d.  It is a 
19-inch, LCD flat-screen.  Other specs:

     Aspect Ratio 16:10,
     Native Resolution 1440 x 900 at 75 Hz
     Pixel Pitch 0.284 mm

Does anyone have an xorg.conf entry for this monitor and/or suggestions 
as to what a workable (or optimal) xorg.conf entry might be?

Thanks much.