The vast majority of systems billed as "jQuery menus" are just "CSS menus" that get some extra effects from the jQuery library. If you find one you like by doing a search in Google, test how it reacts with javascript disabled in your browser to see what it actually gets from jQuery.
Usually the menu will still function correctly, it just won't have the nifty transition effects and what-not.
Spry, at least the version included in DW CS5, should be avoided.