I've been umming and arring about which to get so I went to my local Apple store to actually see them side by side. Am I weird to think that the 24" is just too big? It may have its uses for some things but for me it felt like I was writing an email sitting right infront of a TV. Quite strange feeling. The 20" felt perfect. There's the cost as well, a considerable difference. I think I may get the 20" and pimp out the memory to 1.5 or 2gb.