Mandarin is the standard form of *spoken* Chinese in Beijing and is the most standard/common dialect in mainland China. For *written* Chinese, instead of "Mandarin" you should specify "Simplified Chinese" (for mainland China today) or "Traditional Chinese" (for Taiwan and pre-Communist diaspora). Simplified Chinese is used across China, even in all those parts of the country where Mandarin is not spoken.

Trying to make sense of your second sentence, would it be more clear to say you want a typeface that is NOT the Times of Simplified Chinese? In that case, you should avoid system fonts such as these:
http://www.pinyinjoe.com/pinyin/pinyin_xpfonts.htm
http://www.pinyinjoe.com/windows-7/win7-chinese-intro.htm#fonts
http://en.wikipedia.org/wiki/List_of_typefaces_included_with_Mac_OS_X

Thanks for the clarification Thomas! And to add clarity, I've attached a roman face that I'd like to find as much of an equivalent as possible.

And here is one from the page Jabez linked that seems close! Looking to license something and this file doesn't seem very usable (on a mac, at least).

Any other thoughts?

thanks!