How old is your child and how much do they weigh? Rear facing to at least 4 is the safest - I love the Axkid Minikid and Britax Two Way Elite which will both last to 25kg. The Joie seats are a bit cheaper but they will only rear face to 18kg.
We've got the Joie Stages and have no problems with it. The only niggle I have is that the seatbelt goes across the door opening, which makes putting DD in a bit fiddly. I think a lot of carseats are built that way though.