Off to do more research on this. Â
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Top choices for convertible boosters would be the Graco Nautilus ($150-ish) and the Britax Frontier ($250-ish). Â Both have nice tall harness slots that should fit your eldest until 6+ years of age, and both convert into quality boosters. Â The top harness slot on the Nautilus is about an inch taller than the Radian, and the Britax is about 2 inches taller. Â To me, that would make the most sense- to pass down the Radian and buy a new FF seat. Â When DD is no longer RF, then pass down the FF seat and buy DS a dedicated booster ($50).
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