I have 2, I have a Maclaren stroller that I love love love but obviously is only one child at a time! If I was having another baby I would sell mine and get one that lays back and would just use that from birth. Twas about $250 on sale.

I also have a P & T sport - about $600 with a double kit but I think they are cheaper now. I love it and use it a few times a week for walking with the kids. I know some people don't like them as the child underneath can't see much but my kids love it and they are 4 and nearly 3 - it's a cracking work out too!