Have you ever tried JA Transmenu? See it for yourself with the March release of the JoomlArt Template Club, JA Altair.
JA Altair is a smart combination of Joomla template and Joomla menu system. If you would like to have a multi level menu system for your website then JA Altair is an option that is well worth considering and joining the club is only $39 so with all the other templates you get access to it's well worth the joining fee itself.
JA Altair has two menu system options, 9 header images with .PSD files so template tuning and customization will be easy. You can join the JoomlArt Template Club here.