I have 3 boys - 4, 2.5, and 9 months. We have a double stroller, and it works well for us. My advice to those seeking some input is: what are your needs for a double stroller? And what season would you be using it the most? I would evaluate those first. (and you can always do this after the baby is born!
For example - we use ours for going on walks, to the zoo, and Greenfield Village, but not much beyond that. I use carts for trips to Target or Meijer (grocery shopping with three...NOT advised, BTW :) and also a baby carrier when I can - this seems to be the easiest for me.
If you're wanting a double stroller, we have the Combi Twin Sport side by side, and love it. It's good for leisure things, like I mentioned above. The baskets underneath are super small, but it's light and handles well. I've used it with my Graco infant seat, by strapping it in underneath the seat - not designed to necessarily go together, but it worked snugly and securely! Hey by my #3, I was sorta rolling with "whatever works", right? :)
If you are more interested in a baby carrier, we have an Adjustable Fleece Pouch made by www.kangarookorner.com. I ABSOLUTELY LOVE THIS! It helped me have my hands free with 2 bigger and busy boys. We have used it since my third son's birth, and are currently still using it (church, stores, the park, pretty much everywhere I can...I LOVE baby wearing!)
I would check Craigslist to see if you can score some deals on anything you're looking to purchase.
Enjoy those babies!!