I know a lot of people love the Cosco scenera as a lightweight travel convertible car seat. What comes next? It seems like my 3.5 yo would outgrow that one soon and she is already forward facing, but she's definitely not ready for a high back booster, and needs a harness.

Our main seat for her now is the britax pioneer but it's heavy and huge. Is there a lightweight inexpensive version of that that people like as a travel seat?