Sur­pris­ing­ly, the store you choose mat­ters. For New York City, where rent is half your salary, and trans­port­ing fur­ni­ture is the stuff of night­mares, even a tiny leg up is worth the research. So we’re get­ting to the bot­tom of things—is Eliz­a­beth, NJ Ikea bet­ter than the Brook­lyn Ikea?