ThaKingRocka wanted to warn (thanks!) all the eager importers hoping to save a buck by purchasing the Hong Kong Asian version of Halo 3 that the voice acting is only in Chinese. This is the version that Play-Asia is selling for $49.99 and you may want to avoid it if you want to hear Master Chief talk in a language you understand.
Interestingly, the rumor that I heard over this weekend about the US version of Halo 3 being region free appears to be true. You can import a US copy if you’re in Japan, Hong Kong or Korea if you want to hear Master Chief speak in English.