You say that you want to set up some static pages without the sidebar, so I am assuming that some pages will still have the sidebar. Here is what I'd do:
1) Copy page.php to full_content.php
2) Add
/*
Template Name: FullContent
*/
to the top of the new page right after the <?php
3) Remove the sidebar including the whole div id="sidebar"
4) Add a class to div id="content" so that you have
<div id="content" class="full_content_width">
5) Add
div.full_content_width { width:100% }
to your style.php
6) Add your pages using the WP Pages->Add New panel selecting your new template as the template for the page-- over on the right under 'Template'.
Hopefully that will work. It should at least get you close.
You could add a switch to you existing page.php and avoid creating a new template file, but this way makes it easy to choose sidebar vs no-sidebar as you go along.