I say go the Commodore but in a station wagon, esp. if you have a large pram or 2 prams. We have a VT Commodore sedan and find at times the boot wasn't big enough for our pram and it wasn't a very large one either. This may sound weird but we notice the hinges on the boot come down too low (when shutting it) and if you have filled the boot up it won't shut properly. The inside is nice and roomy though.

Or even a Falcon wagon would be good too.