This is a trapping we seem to get into, for getting a good credit rating. This is probably going to change somewhat, with the new regualtions coming through. I don't know how they are going to change, we are just going to have to follow the news on how this will affect us.
If you do need to have a good credit history to get a better loan, is to try this. Get s0mething you will need. That is something like a freezer or refigerator. By paying this off you will develop a credit history, and you get something you will actually need. Don't get something like a huge plasma television, which would be nice, but a lot less necessary.
By the way, dont cancel the card right away. Part of your score depends on how much credit you have and how well it is paid off. Keep is tucked away, and enjoy something usefull.