Help with booster seat confusion!

[whoami24601]

My small DS (16.8kg and nearly 6!) is ready to move into a booster. I've got a Citroen C4 grand Picasso but often need three car seats in the back (1 other booster and one RF baby seat). I took him to Halfords but the ones there all seemed really wide and wasn't sure they'd fit! So I'm looking for a slim HBB with good side impact protection. Budget is up to £100 so nothing crazy! Can anyone advise?

[whoami24601]

Oh forgot to say isofix would be a bonus!

[whoami24601]

Anyone at all?

[LunchWithAGruffalo]

We had a britax adventure which at the time seemed among the slimmer ones. It wasn't isofix, but they may do a similar one which does.

[ExTeacherNowJustMom]

If you need to get three car seats on the back seat, I’d suggest not getting isofix. We have found that our car seat, which uses isofix, wastes a lot of space next to the car door, meaning the person who sits in the middle seat ends up being squashed up to the third person.

[Vanannabananna]

We have the joie trilo with isofix which DS says is very comfy. I k ow friends like the cybex HBB

[JC12345]

It might be worth having a look at i-size boosters as they are generally narrower than others.

[whoami24601]

I did look at the joie trillo a while ago and it seemed good. I find choosing a car seat so stressful. I want them to be safe, but some are crazy money and I have no idea why! What's so much better about the £150 ones?!