Usually I like not too high of a resolution because I like the text big and icons big and stuff. Like for example, I think 1280 reso on my 13" is just nice and I don't need anymore. For example, when I connect my 13" to an external monitor, I only use 1600 reso, even though it can do 1920 reso. So do I need the higher resolutions on the 15"?