So your two reasons for designing the UI this way are "it looks cool" and "it's different than what everyone else does"?
In that case, my answer would be: I don't think those are good reasons to design a UI a certain way. When creating user interfaces, one of the most important things to remember is that you're not designing for yourself, but for your end users.
That means you should find out what people visiting your site expect, understand, and have used before. So, for example, do a usability test with some of your users where you observe them using a competitor's site that places the select box outside of the search field, and then observe users using your design. See which one works better (there may be no difference, as this is a pretty small piece of UI).
But overall, keep in mind that "it looks cool" and "I like to be different" won't get you taken seriously as a UI designer. Most times, you need to have facts to back up your argument. Usage data or metrics are a good start.