another computer question

Well, I haven't bought my computer just yet. I just got the money to buy it yesterday so I couldn't have done it sooner anyway. I do want to buy the iBook, but I'm balking because I am worried about the powercord issue (and can't afford the Apple Care thing)... And I'm not sure if I will like the size. Now, I don't have a whole lot of experience with laptops... I used one of my suitemate's laptops when I was living at LSSU and I have used Carrie's and Scottie's laptops. All of these have had larger screens it seems. Now... small in laptops is good and all but basically I'm looking for my laptop to be a desktop replacement. Small, light and thin are nice but aren't requirements.

Is 12" too small? I'm going to deposit the money tomorrow and then I'll have to wait a little bit before I can order my computer so I have a little bit of time left to decide...