I have 2 girls, 28 months and 2 months. We used the cheapo seats with my first because my wife couldn't see laying down $300.00 for a Britax. Notice I said "seats", there was always something that we didn't like about the el cheapos so we kept buying another one at 60 to 100 dollars a pop. We went with our Eddie Bauer carrier for 2 weeks with my newborn, then we got a Britax. Carriers are a waste, get a "New Native Sling", (look it up on the web). My wife is very happy, she doesn 't blow a gasket everytime she puts the kids in their seats, we should have bought it 2 years ago. Before she had to readjust them every time.
Britax. Any model, you will never regret it.
The sling is great too.