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We used Chicco Keyfit 30 car seats for our twins along with the Chicco Cortina Together Double Stroller. The car seat was great, clicked in & out easily into the car and to the stroller. Since our twins were small we were able to use the Keyfits til 18 months or so.

We have the graco click connect 30. It's relatively lightweight, simple, and basic. My daughter is 8 months, and I don't think we've carried her around in the seat more than a dozen times. She's small--only 16 lbs--but we prefer babywearing. That said, the seat has been fine and we just ordered a graco convertible.

For stroller I would definitely get the baby jogger city select!!!!

We have a graco snug ride 30 and it does the job just fine

The city select jogger is super awesome, but we couldn't absorb it in our budget. The contours is under 300 which is why we went with it. Still sturdy and easy to use, but bulkier.

We have the Maxi Cosi Mico. I didn't pick it, a friend lent it to us, but I like it a lot, it's nice and light.

The Baby Jogger really is a great stroller - easy to handle, pops up and down nicely. Have you test driven a few? It really does help you decide. My friend bought a cheap double stroller (not sure which one) and hated it, she said it felt like trying to drive a battleship.

Britax B-Safe. Its their smaller model and of course still has amazing safety reviews. My daughter was in hers for a full year. I carried her in it for prob about 8-9 months before I just removed her from it in the car. I didnt find it too heavy. The Britax B-Ready is an AWESOME stroller with double capability. The great thing about the B-Ready is you can fit TWO infant seats but they are not side to side. They are front and back. Its what I have and I honestly love it. Its a very versatile stroller and I bought it with my first in the mindset the with the future LO I can have an infant seat and a reg seat. Fit both the kiddos WHEN I want, not all the time, and its not huge and bulky and I would only need one stroller instead of a single and a double. Make sense?
Here is Britax demo video on it.

For our twins, we got two Chicco Keyfit 30 infant car seats. They go down to 4lbs and they were perfect for our preemie twins. By the time they were discharged from the (nicu) hospital they were about 5 lbs (maybe slightly less) but they both passed the hospital's car seat test.

As for stroller, I got a used Joovy twin roo stroller that the car seats snap & click in. The Joovy twin roo is similiar to the snap and go, but from what I heard from other twin moms that the Baby trend snap and go used with chicco car seats recommend & suggest you use straps. It was an added step that I didn't want to worry about. I don't regret getting the Joovy twin roo. I bought it for $60 used and will sell it back to a fellow local twin mom when we are done with it.

As for stroller that will be used when the kids are older. I registered for the Contours Options tandem stroller but my brother ended up handing down his City Select stroller. It was my dream stroller but it was a tad expensive. I did get two used chicco car seat adapters for the stroller, so I can use that stroller to tote the twins around. It works for us. DH puts the joovy stroller in his car and I have the city select in my car. The city select is much more compact when folded but the joovy stroller does have it's pros. It's much easier to get car seats and babies out. The city select is a staircase type install so it can be a little cramp when both car seats are installed in the city select and you have to get one of the babies out. It works. I love the versatility and the future trips of it. I have already took the babies out on the city select with the regular seats (not with the car seats) and it's great.

I highly recommend getting strollers used.

ETA: Congrats on your twin pregnancy!!