Married, filing jointly or separately

Hi, all previous years I & my wife submitted taxes as married, filing jointly, but our income grew up and Id like to file taxes as married, filing separately. My wife did $400K and I did $64K+$40K(realestate business). I believe we can save round $3-4K on FederalTaxes because if filing separately - my bracket is-24%($25K) and her 37%($148K).  If jointly - our bracket is 35%($177K). Plus we can save on StateTaxes. We dont have dependents & live in NJ/ Does it worth to change the status to filing separately? Or may be some under water obstacles...