There are a number of threads about this in the "Echo Lounge" sub-forum here, such a this one. Ultimately, though, you're going to have to download them and try them to find which ones suit the way you like to work.
PS: I'm going to lock this thread so we don't end up with yet another chain of "I use Zend Studio/PPHDesigner/Notepad++/Aptana/DreamWeaver/Emacs" replies.