Get a 24" monitor over 22" because most 24 inches have a 1:1 scaling option for 1920x1080 which is a rez that the 360 can use. Also, 24 inchers have a higher pixel density. 22 inch lcd monitors have lower pixel densities than usual because the manufacturers kept the same max resolution that they used for 20 inchers. If you get a 22 inch, then most likely you'll have to strecth 1360x768 to 1680x1050 which won't look as good as 1:1 scaling.