I believe that if you sign in to iGoogle you can alter your preferences to return to Google Classic - whether this solves the problem I am unsure.
I use a version of the Google homepage that does not require me to sign in to anything and which does not have the annoying suggestions box. The URL is http://www.google.com/webhp?complete=0&hl=en. If you want this as your home page then you need to set it as such - Tools - Set Home page as and put in the URL.
This definitely allows you to type in your searches in the middle of the page.