If you dont need to shlep up stairs then you probably don't need a lightweight stroller at all.
Dan, ppl that live in the city (NY) its not worth it to get a UB. There constantly in and out of cars and do very little real walking. Ur snap and go should be fine for most city ppl. The most walking they'll do is to shul on shabb to pick up the husbands and back. Otherwise most ppl are in and out. The UB takes up tons of trunk space and is a shlep for the wives to put in and out. Living in IL you truly need a good stroller, its basically your car here.
a reliive of mine who moved back to America, and his wife demanded a crossover SUV (rouge) saying she needs it for the space, (shes from Passaic, don't blame her
but now they realize with thier Buggaboo (dont blame her shes from passaic :-) theres no space anyways in the trunk.
So sometimes it might be worth it to go small, but in these cases if say get the best car seat bec thats what will be a staple in the car. (The evenflo is amazing with the latch system - so easy to use)