Moving Center/Post Content below or after Sidebars

I'm not sure if this is a theme issue or one to take up in the WP forums, but I figured I'd give it a shot here.

I'm creating a widgetized front page for a site that I'm currently working on. Instead of creating new sidebars, I'm going to selectively use the existing four to achieve the effect I want.

At first, I used a older method of adding three extra sidebars to front page and decided against it. However, by doing it that way, I was able to either have the center post content show up either before or after these "hotwired" sidebars.

Is there any way to achieve this with the current sidebars as is?

Basically, I want it so that if anyone posts content to the front page, it would fall below sidebars as opposed to loading up along side them.

Would I just need to create those independent front page sidebars again?

Any help provided would be amazing!