You and me both! Have you taken a look at vocalizer-nvda.com? I know the driver is specific to NVDA, but in my opinion, it's as good as you're going to get. They do have a Taiwan Chinese voice too. I don't know how good it is though since I don't speak that variant. I know the Japanese voices are decent as well. I use them to play Japanese Audiogames, and on my English system, they perform really well without having to mess with character encoding formats. There are a few SAPI-based voices out there in many languages too. Otherwise, I would consider downloading Japanese NVDA. It has support for many of the CJK languages. Also, the Mac and iOS devices have some really good-sounding voices that you can use with VoiceOver.

Yeah. I've been meaning to give you a call on Skype, but I find myself very busy most of the time. I'm happy when I can get some time to check out the AudioGames forum. Anyway, maybe you can help me improve my Mandarin, and we can try our hand at switching to Korean and Japanese. I speak other European languages too, so if you know some, I'd be happy to talk to you some more. As for the TTS thing though, I'm afraid options are very limited. I do vaguely remember someone posting a topic about Zhengdu screen reader for Chinese users. I used it for a while, but I remember it was really slow on my system. But I remembered there was a way you could use the voices from that application to interact with other speech applications. It was like its own speech engine.

there are NVDA addons for jtalk and protalker on jake gross's website.