Many of them, if you put in the right components, are very professional. That said - you really HAVE to make your own if you want them to fit your site. BV could offer thousands and not have the right one for any particular site.
And you'll find that with BV - you can make your OWN template - and thus have the site you want - without using templates.
And - if you do a search - you'll find that most things like this have been written with specific instructions - you'll find the instructions for making your own nav buttons here:
http://www.vodahost.com/vodatalk/blu...s-nav-bar.html