I personally like Combi, it's very very light and easy to fold and carry around. However, it seems smaller than the European brand baby's stroller. If you don't have a car, it's better to carry the light one though, coz it is more convenient especially when you go out alone with your baby.
My own opinion: you should not expect to let your baby use the same stroller from born till 3 or 4 years old. Once they grow up and when they are able to walk, they will refuse to sit in a stroller. So, I think you should not invest too much money on it and don't really need to think of buying a bigger size of the stroller.