A.S.
I've heard nothing but great things about the Chicco Citta Twin in terms of a double umbrella. I have a Kolcraft double umbrella that is also, surprisingly, very nice for as little as it costs ($50). Both are side-by-side, but umbrellas rather than ones to accommodate a carseat. However, if you do Bjorn or sling through the first months, then that shouldn't be an issue.