Congrats on the new addition to the family
We used a Peg Perego baby seat and stroller and strongly recommend it (for the same reasons as PrimoM3). We found them extremely well desgined and user friendly. Easily adjustable as the little one grows and very easy to use (strapping the baby-in, tightening the belts, snapping the seat in the car or on the stroller). We also had a base in each car (wife and mine).
We swithed to a Recaro when the little-one was about 15 months old. The Recaro has a very wide range from 20lb to 120lb and eventually converts to a booster seat. So here, only two seats are required before she can use the standard car seats