Template "specialisation"

I want to use a sitewide default template and use a specific
version in some
controllers to have a good DRY approach to my layout. Those
controllers
should add a little bit more HTML before rendering the
results of the
actions, in order to avoid copying the entire sitelayout
every time.
How can I do that? Currently my code is like this:

class WelcomeController < ApplicationController
        #before_filter :show_options
        layout 'mydefault'

        def contact
                render :partial => "contact"
        end

        private 
                def show_options
                        render :partial =>
"welcome"
                end
end

This only shows the app/views/welcome/_contact.rhtml page.
It does not show
the layout (that does work in other controllers where I
don't use these
things). If I then enable the before_filter (is that the
right usage, it
does not feel like that) then it only shows the
app/views/welcome/_welcome.rhtml page, which is not what I
want either. 

So how should I do this? How should I have this controller
use the
layout 'mydefault', render the _welcome partial before
every method and
also render the contact partial when the contact action is
called? 

I really think I'm not using the right tools here,
especially before_filter
seems a bit wrong here.

Thanks for your help,
Bart


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