How to find the right Dhamma teacher

The practice of Buddhism, as with any other spiritual development, largely relies on the guidance of a good master. With the large variety of traditions and practices out there, how should one go about looking for the right teacher to guide one along the (right) spiritual path? I have been to retreats conducted by teachers from the Theravada and Chinese Mahayana tradition, and I am interested to find out more about Tibetan Buddhism.