Hi MarriedBlonde
We signed up for the free trial last time to find the best seat, but to be honest the information was not that good.
It is a nightmare for a parent to purchase a bady seat, you want the best for your child but don't know enough to make the choice.
The best source of infomation we found was the German ADAC reports (which are no problem to surf if your wife is German) and at the time the Britax ISOFIX Duo Plus was head a sholders above the rest in all tests for a Group 1+ seat.
We also loved our Group 0 Britax ISOFIX seat, the ability to click and go, and know your baby is safe was fantastic.
The only other recomendation I can give is look at the euro ncap results for the A3, because Audi will specify which seat they should use, you can then see the performance of the seat in the tests, and ncaps comments.
Fingers crossed you will never need the safety aspects of the seat, and the colour will be the hardest choice.
Chris.