Booster Seat Suggestion (7+)

Hi guys we currently have 2x Maxi Rider AHRs for the girls 7 (b/w 120-125cm ish) & 6 (about 120cm) but ours are the older version that go by weight.
Both the girls are at or just over the 25kg limit so we need to look at a new booster seat that will now suit them for height / weight until they are tall enough to go without a seat.

We don't want to spend a fortune as they won't be in them for too long & we have 2 in restrained boosters ready that they are nearly too tall for.

What suggestions & reviews have you lovely people got for me?

Both of ours are in Safe and Sound Hi liners, I think from memory were $189 each.

I think a friend said she has a hi-liner that's only 3yrs old which means I would only have to buy one... What height do they go to feeb do you know?