It isn't that difficult in suffusion, it just takes a little patience when it comes to customizing them. This is a site I am currently building in Suffusion, the menus were created using the suffusion options. http://www.bpdglobal.com
I believe someone else already pointed you in the right direction, but I will offer it again. From the admin control panel, go to "Appearance -> Suffusion Options ->Skinning ->Navigation Bar Above Header" Be sure to select "custom style" and you can modify the appearance all you like.
Ok, directly in WP I got some menues as I like them
But what about suffusion-theme?!
I seesm to be quite difficult, or not?!