Was searching for compact child seats with the highest CREP safety scores that will fit 3 across the back seat and found that the Infasecure Visage Astra ticked the boxes. It's only really suitable for toddlers and above as I'd not recommend front facing seats for children under 12-18 months.
This seat scored really well with 3.8/5 in front facing mode and 4.5 in booster mode see https://www.childcarseats.com.au/node/1242
It is also the tallest booster in Australia so should support most kids beyond 8yrs old subject to their height and weight.
I paid extra for the Aqua coloured one for my boys which is $259 https://www.amazon.com.au/Infa-Secure-Visage-Convertible-Boo...
But if you have a girl or don't mind purple, $210 is a steal.
If you don't need to fit 3 seats across then go for the Infasecure Rally II as it's cheaper ($149 at Big W) and equally as safe.
This seat beats the safety scores of the Britax Safe n sound Graphene which is a popular compact seat and it's also nearly a third of the price.
On a separate note (since this seat doesn't have ISOFIX) another fact I discovered is that ISOFIX tested to be safer ONLY for front facing modes and performed WORSE than seat belt fixture mode for rear facing on the Graphene. Very interesting fact to research on especially if you're considering ISOFIX for rear facing modes. This applied to the Graphene which is another seat I also have.