And don't forget the taiwan brands as 1/8 buggy is very popular there so these manufactures develop good products like HN, Haobao, etc. And serpent have good parts support in HK as well.
Take a look on the car use for race in China and u will see roughtly the popular cars for 1:8 buggy. TeamC T8 and T8e seems to have a good market share. The race has a lot of people from HK as well.