youve got the waves c1, probably industry standard http://www.waves.com/content.asp?id=158

renaissance comp- adds colour like classic hardware comp - http://www.waves.com/content.asp?id=123

sonalksis - ment to be as good as high end hardware- http://www.sonalksis.com/index.php?section_id=315

neodynium - new type of compression looks innovative havent tryed yet though. http://www.elementalaudio.com/produc...ium/index.html

i prefer the sonalksis but you cant go wrong with the wave ones.