Double Stroller Questions: 2x + moms

cswatch

LO #2 will be arriving in a couple of months and we've been talking about what type of double stroller to get.  Our infant car seat is the Chicco keyfit and we have the whole travel system, bases, etc. from LO#1.  

Would it be worthwhile to purchase Chicco's double stroller so the infant seat snaps in, etc., or should we go with a lighter weight (perhaps umbrella style) double stroller that both LO's can use once the new baby is a few months old?

I'm just not sure how much use we'd get out of the Chicco one...  our single one is nice, but it's very heavy and cumbersome, so as soon as LO was big enough, we started using an umbrella stroller.

Just looking for suggestions.