It seems Singapore and Hong Kong are quite attractive because of the low corporate taxes and great infrastructure. But best to take advice from a lawyer and accountant.
I would second Singapore, they have a favorable government and stable government, fairly low taxes and they are actively trying to attract non-manufacturing sector companies. It would be one I would look at if I where looking to open an Asian operations. A second would be Australia though often overlooked when looking at Asia it has a fairly start-up friendly business environment.