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.

theDawn adds dropdown capability to WordPress custom menu widget. The result is what you see below.