Good books on economics?
 

Does anyone know of any good books on economics? I am particularly looking for a book on:

- History of economics
- Political economy
- Theories of the major economic thinkers
- Various political/economic systems (eg communism, socialism, free market, etc)


I just want it for my own interest/curiosity. I've looked on Amazon but I'm wondering if anyone knows of any book like what I've described above, that they've read and found interesting, comprehensive and informative.