My quite small 3 year old is in a Joie ispin 360 and content but her little sister had outgrown her ilevel and needs a new seat. We are thinking of putting the 1 year old in the 360 and getting a new seat for the 3 year old but can't figure out what one would work. She is forward facing as she gets badly car sick so don't need that facing options. I'm finding it hard to find one that is really safe, had a harness and is isofix. Any ideas?