Purchased a 24" LED monitor with 1920x1080 resolution. After looking at it more closely, I am wondering if it is too big for my son who would be sitting about 18" from it when using it. Wondering if I should have gone with something in the 18"-20" range though most of these are more like 1600x900 resolution. If I went with a smaller monitor with a 1600x900 resolution, would it be significantly inferior to I already purchased? This will be an xmas gift so at this point he hasn't used it. What is killing me is a scored a really good price on the 24" but returning it would be a pain in the a**.