I don't think you'll be able make it your landing page. What you can do is set up a static page as your home page and then have the posts display only via your custom menu link.
Create a new page and include some type of welcome message on it. Publish the page.
Go to Settings ->Reading. Select "Front page displays" a static page and next to Front Page select the page you created. Save Settings without selecting a posts page. http://en.support.wordpress.com/pages/front-page/
Then head to your custom menu again and make sure the home page you created is included in your menu along with the link to the chronological feed.
Just note that static front pages are traffic killers, as many people won't click past it to the posts. Publishing your posts chronologically without having your regular reverse-order feed as well might also be harmful to traffic. I understand why you want your blog structured that way, but I just want you to know it can have unforeseen side-effects in this regard.