Doing a bit of research for bro who lives in New York re: car seats . . .

[SaveFerris]

. . . they don't have a car, but use taxi's sometimes / travel quite a lot, so would like a car seat which lasts longer than 12 months (so stage 0 to stage 2 is it?).

Which is the best in terms of being light enough to lug around if needed, but fairly easy to fit safely?

x

the maxi cosi is the best infant one, although graco are decent too, and then he wants this one, from 1-12 years
www.gracobaby.com/catalog/product.aspx?modelNumber=8J00BRV

Car seats in the US are different than here, he'd be better off going to Target/Babies R Us/Costco and checking them out for himself. It's so hard to know if you're going to be able to carry something around until you see it in the flesh.