Double strollers

My husband and I are expecting our second child in sept. Still a long ways away but we figured it's a good idea to start looking up strollers. We have our singles from my first who will be 4 by the time baby comes. However she is sa bit small for her age so she still gets tired if she walks to much. And then cranky. Which is why we are looking into a double stroller. I had my eye on the graco ready2grow but I also want to see what other parents like. Any suggestions on a great double stroller that'll work for both and infant and little kid? Thanks in advance. 😄