Best Theme for WordPress

Who can tell me which is the best theme for wordpress? I want a theme that can have my categories appearing as top drop down menus
I am currently using Apricot 1.2 by Oliver Baty at http://www.tituslow.com
but I am thinking of one that can handle the menu.

I have another two blogs also using WordPress theme Dojo

http://www.mhchealthcare.net

http://laughter.mhcasia.com

These two themes are white and clean but lack the drop down menus