QUOTE (CallMeAliG @ 20/11/2012, 03:01 PM)

So a general question - even though I know she CAN go in a booster with normal seatbelt once she's 4, is 5 point harness still safer? Should I keep her in 5 point for as long as I can, or is there a point at which a normal seatbelt becomes better? She's finally learned to do up her own 5 point, so it would be more convenient than a car seat anyway... but are there negatives?
Yes, a restraint with builtin harness is safer than a booster, providing of course that the child fits. Most kids can fit in a harnessed deat beyond 4yo, so providing your 4yo still fits in a new harnessed seat, then that is what I would do.
QUOTE (CallMeAliG @ 20/11/2012, 03:01 PM)

I was thinking of getting something like what she's already in, which was a 5 point convertible to booster (infa trek 8) - this means DS could use it as well. But does this mean I'm taking a few steps down on the safety ratings scale, because the top brands in booster safety are not the same as the top brands in normal forward facing?
The Trek 8 is a convertible booster - that is one option, but yes the last CREP found that convertible boosters tended to perform well as a FF seat but not as a booster. Most people don't like using them as a booster, so tend to get a dedicated booster at that stage.
It kind of depends on what you want to spend - as the PP said a Compaq would do ($375) or you could look for one of the other versions with the same shell such as the Lifestyle, or the Guardian etc which have the same shell but a simpler base. The height markers will be the same as the Compaq. The new Maxirider T & A is pretty $$, but I imagine it will retain value second hand so could be sold afterwards if you wish.