Sharpconstruct, the ZBrush of the poor people! :) No, really, it is very good, easy, and free (as in beer and as in everything). I think it is very well headed, it will need a little time for improvement, tough. Just check it: http://sharp3d.sourceforge.net/mediawiki/index.php/Main_Page
It might be too specific but the Facegen Modeller provides very realistic results and is modestly priced at $100. And as a rare treat its easy to use right from the start. http://www.facegen.com/