Indonesia (Bali and Central Java, around Yogyakarta), Nepal, and the “Golden Triangle” of India. Maybe also Sri Lanka and Myanmar, especially Bagan and the lake. I haven’t been to Bhutan, but I suspect that would be on my list too.

However, regarding China, unless you have traveled very extensively there, there is a ton to see there. Tibet would be very high on my list of Asian destinations if you haven’t been there, and also Yunnan province in southwest China — those are areas that don’t tend to get a lot of foreign tourists. Lots more in China too, which is more like a continent than a country.