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From a UX perspective, your header is way too tall. It's a case of form over function.
But if we're talking only about the form, the header with the photo looks the best to me. Otherwise, it's just too much space for a solid color or gradient.
Reduce the height by 50% and the page will look more balanced. And the gradient options will have more appeal.
Looks pretty good. Any reason you decided to remove your W logo rather than scale it down as well?