Looking to buy dd an ERF car seat as she is fast becoming too big for the baby carrier. I want it to be isofix, obviously ERF and with a 5 point harness. Am getting completely lost in research and confusing myself. Unconcerned about cost just want it to be the safest car seat for her. We do lots of motorway driving extremely regularly. At the moment I'm looking at nuna rebl, be safe izi combo x4 and Joie stages.