I am planning to purchase a new iMac 21" for my daughter but I would like my son (who is only 4 and will only ever use a browser) to be able to use it too. So I'm thinking I would buy an external monitor and extra mouse and wireless keypad for him. Is this crazy or will this work? Basically I would just set up a browser on the 2nd monitor for him. What do you think? HAs anyone else tried this? Any recommends for the 2nd monitor?