You should be able to set the content page to Registered Users and leave it unchecked to not include in the Menus.  Then add another new page that is in the menus, set the Templates folder to none specified (so no modules get inserted on to the non-page), set permissions for All Users.  Then expand Advanced settings and scroll down to Other Settings, Link Url, change the Link Type to Page, then select your target page (the one set to Registered Users only).  Click Update and you should be all set.  This assumes I understand you correctly.  If they click that link/page in the menus, it will take them to the login page (if they do login, it should take them back to the Registered Page).  I hope that is that is what you are looking for, if not, speak up.  Cheers - Jeremy 

Great... Thanks guys... it worked !!  One more question.... where do i edit the text that shows up when you register?  I want to put my own message?

It says right now: 

*Note: Membership to this portal is Public. Once your account information has been submitted, you will be immediately granted access to the portal environment. All fields marked with a red arrow are required. - (Note: - Registration may take several seconds. Once you click the Register button please wait until the system responds.)