We think we have (finally!) decided to get the uppababy vista. So the next decision is now the car seat option which baffles me. The prices jumps a lot with the cybex and base though the base can be used with the sirona z later on. But I was thinking if I just bought the sirona s/joie I size 360 type car seat with the base attached from the get go then it will be cheaper long term. Or I could get the travel system with the isnug or the maxi cosi cabriofix which are the cheaper option. I'm a ftm as I'm sure you can tell! Is it essential to have a car seat that can attach to the pram?! Thanks!