I have 2 daughters (5.5 years and 5 months). We have 4 car seats: 2 infant seats, a 2014 Clek Fllo, and a 2016 Diono Radian RXT. One of our infant seats just expired, so I'm planning to move the 5 month old into the Fllo (she just hit 14 pounds). This means I need a new car seat for the 5.5 year old. She is 42" and just hit 30 lbs. I was originally going to just buy another Radian, but in my research I just realized she'll outgrow the Radian by height before she can ever use it as a booster. Any suggestions for a good seat for her? Should I just move her to a HBB with a lower weight limit of 30 pounds (though not sure what my options are there)? She's going to stay harnessed in the Radian for now at least in one car.