If you want to go to a “light” software and away from Dreamweaver MX 2004 I have two suggestions –
Notepad2 from http://www.flos-freeware.ch/notepad2.html
and
jEdit from http://www.jedit.org/
Dreamweaver MX 2004 would do the trick. You can download a 30-day trial version from Macromedia.com.
I suggest if you do choose Dreamweaver then go with version MX 2004 which best supports XHTML and CSS standards.