Hi Everyone! I have never purchased an apple computer (always had pc desktop computers) and would like some imput from the members. I am choosing between the basic 21.5 inch model and the basic 27 inch model. I have vision problems and thought that the 27 inch model would provide me with a clearer, sharper image as well as making it easier to read newspaper articles, etc, for example. I know little to nothing about apple imac computers and would appreciate any feedback/advice from the members! Thanks.