The problem with twins is that when they are little the needs are different than when they get older. You should plan on two strollers, you can sell the first one to help fund the 2nd one (at about the age of 1 1/2)
I really liked my Eddie Bauer in-line when the babies were little. I started with a Peg-Perego b/c it was supposed to be the BEST -- but it was heavy, had hardly any storage, and once they were out of the car carrier's the seats did not recline very well. The Eddie Bauer has a snap and go; plus both seats fully recline; and you can turn the one in front to face eachother, which is helpful when feeding or just for their entertainment. It also had way better storage, and was light in comparison. But they are hard to manipulate when shopping, and are always heavier and harder to push than the side by sides. I've just never seen a side by side that accomodates car carriers -- if you find one, opt for it.
The side by side that is pretty slick (my friend has it)- that is the Combi Twin Sport. Lightweight, compact with durable wheels and easy maneuvering, and good storage.
However, by the time I figured out life would be easier with a side by side, I just had a cheapo-graco and it worked just fine, though it didn't last. After that I bought two $20 umbrella strollers and stroller clips and used that for travel b/c it is easier for air travel, you can separate them if you need to, and was extremely light and efficient and I didn't care it it got ruined.
