If you just want to type Chinese (e.g. on LiveJournal), you don't need to get a full-fledged word processor; it would seem to me that an IME would be sufficient.
If you want to go the NJStar way, they have one of those (NJStar Communicator), which would also be cheaper than buying one of their word processors.
If you're using Windows XP, you could also give the Microsoft IMEs a go -- I believe they have several different options each for simplified (zh-CN locale) and traditional (zh-TW locale) characters.
Unfortunately(?), I'm not sure whether Pinyin input is one of them for either locale, so if you're not too good on Zhuyin Fuhao input or Wubi or Cangjie etc., then NJStar Communicator may be better.
IME vs WP
If you want to go the NJStar way, they have one of those (NJStar Communicator), which would also be cheaper than buying one of their word processors.
If you're using Windows XP, you could also give the Microsoft IMEs a go -- I believe they have several different options each for simplified (zh-CN locale) and traditional (zh-TW locale) characters.
Unfortunately(?), I'm not sure whether Pinyin input is one of them for either locale, so if you're not too good on Zhuyin Fuhao input or Wubi or Cangjie etc., then NJStar Communicator may be better.