Regarding HDCDs from China/Taiwan/Hong Kong, make sure you are getting a legitimate disc. Counterfeit CDs are everywhere in those areas, and HDCD are one of the new buzz words that get printed on the packaging of these pirated discs.
You need to know which artists are on which label in that part of the world, and whether that label supports, or had a history of supporting, HDCD. For example,
this CD, is remastered in HDCD by HK Warner. HK Warner has a history of supporting HDCD.
Yes, it's very complicated.