I agree Syafiq's viewpoint, having a high pay would definitely help in reducing corruption. However, there would be another issue as Dylan has brought up. By having such a high pay, we would definitely be attracting the cream of the crop, however should these people only be interested in the high pay and not to work for the citizens, they may not be the best lot for the job. Of course this is not to say that ministers should be doing voluntary work as some would suggest. they need to support themselves too.
Amnesty International is an example of an international watchdog group aiming to protect human rights across the world. An example of their work would be the release of political prisoner of Burma, Aung San Suu Kyi. or something like that