The beauty of someone like Alan Watts (and anyone else who I will mention here) is that they bring an original and creative voice to something known. I will mention a few people here who bring Eastern Philosophy to a western audience, but they each speak about it in very different ways, and their 'thesis' (for lack of a better word) will differ from Alan Watts. The criteria for someone being included in this list is that they are above a certain level of intellectual stature (not just some garbage 'new age' teacher); they draw from Eastern ideas, and deliver them to a Western audience; they don't suck.
- James Carse
- Anthony D'Mello
- J. Krishnamurti
- Chögyam Trungpa
Karlfried Graf Dürckheim (can be a bit heavy)
Also, if you enjoy stretching the fabric of your comprehension skills, Martin Heidegger has some extraordinary works that are almost impossible to comprehend, and yet - quite satisfying when you are able to extract the insight from what he is saying. Another author worth checking out - although only similar to Watts in that he teases the intellect with paradox and unpredictable inquiry - is Milan Kundera. He's definitely not for everyone, but I always find my view of the universe has been altered after reading his works.
This is a subjective question - met with a subjective answer - one that I wouldn't be surprised to see engender some disagreement, but all of the above authors have excited my intellect in a way similar to Alan Watts.