Bigger logo will not break your layout. Additionally there is a nice optional site description when a user hovers on your logo

A sleek log-in box slides down when you click on log-in button, give it a try. This header log-in feature is optional.

Header search can be disabled/enabled.

Top menu with unlimited dropdown levels, current-page highlighter, and arrow indicators.

This area is called "Header intro" it contains a title and description text, you can completely turn it off to save some space, or leave it enabled and customize it's content.

Title: has numerous options.
Text: If not disabled, the following can have custom text: a page, all pages, a single post, all single posts, a single portfolio item, all single portfolio items, blog archives, portfolio index, 404 page, search results page.
Custom text can be blank.

ShareThis, About the author, and popular/related posts wigets are all optional.