NeoOffice was recently updated to be functionally equivalent to OpenOffice 2.0. I have both installed on my computer, but use NeoOffice because text/graphics look more Mac-like with anti-aliasing, and it uses the Command key rather than the Control key. Other than those differences, they seem to be functionally identical, except that NeoOffice is a native Mac application and does not require X11.
http://www.neooffice.org/