We have the Platinum AHR AIR and love it...It is the same shell and basic design as the Meridian AHR Tilt an Adjust, just with the added air cushion...the rest of the seat is the same components.....you can pick up a pre new regulations Meridian a bit cheaper at the moment because of the new meridian...the seats are identical, all that has been added are height markers. Alot of people on the carseat forums are grabbing the older ones because the height marker on the new ones is so short it means you have to turn you bubba usually before the 12 kilo mark.....if you a weight rated seat you don't have to worry about the height so long as you always make sure there is a clear inch between the top of bubs head the top of the headrest insert........

In short my recommendation is a Meridian or Platinum Tilt and Adjust pre height markers....