Ive got an Axkid minikid for my 5 year old and 1 year old still in infant seat. Thinking ill get the baby an 18kg seat to do until the 5 year old is out of the axkid in the next 1-2 years. What do I want? I drive a vauxhall insignia so don't think there are too many issues with fit. Been looking at the joie seats but lots of options with varying price points. Will I notice a big difference in quality? Should I just go for a second minikid?