The old CRT I'm using is set to 1280x1024... I miss being able to fit videos in the background while I'm working, but I'm frelling thankful for the durability.
I generally set my interfaces to use 1024x768 by default and then stretch. However, I've begun using 854x480 for my single player projects. I'm hoping it will be good for 480p YouTube videos, but I have yet to create any.