That's great to know that Myunity is working good for you. If you want to add different extensions for Gnome-shell, then extensions.gnome.org would be a great place for you. This site will help you to get excellent extensions for gnome-shell. Not only that, this site will also show you the status of any extension, whether it's installed or not, if you visit that from your gnome-shell desktop. You just need to press the button on/off on that website to use a extension.
Moreover, if you want docks in ubuntu, then you have several choices, like
3. GLX/Cairo dock
you can choose any of this. Each dock will give you panel to administer the dock.
Hope these information will help you.