K.T.
I LOVE my Baby Trend SitnStand LX Plus. My oldest was 16 months when #2 was born, and the LX PLus has a full back seat with 5-point harness for the older child, which is fully removable. Having the full seat in the back was what made me buy that model, and it was very helpful when my oldest was younger. Your oldest is older than mine was; is he/she going to want to ride in a seat, or simply sit on a jump seat and be able to get down whenever? If you don't need the full back seat, you can get the regular SitnStand, which I believe is a bit less expensive. The Graco car seat snaps in easily to the front of either model. Of all my baby equipment (including the great Metrolite stroller I had when I only had one), I like this stroller the best. It's pretty narrow and thus easy to maneuver for a double stroller, and really pretty lightweight but still sturdy. Hope you find one you love!