What kind of chess computer should I get?

I'm 12 years old and looking for a quality chess computer that doesn't cost a fortune. I am not, however, looking for a computer that teaches you how to play. I have been playing for 6 years, so I want one that has high difficulties. Anyone have any ideas?|||Any computer. Decide based on anything else. I would suggest an apple.|||"Rybka" is by far the best chess engine you can get, and will help you analyze any games you have. To help analyze the games you should also get a virsion of "Chessbase", which is easy to use and has a built in database of games.