I am in the same boat as I have 3 under 5. As one of the major things you may need to take into account is "will 3 kiddy seats fit across the back seat" it limit things a little. The ol' holden commodore does the trick but we were looking at the Mazda CX9. Took one for a drive and is really good, heaps of room everywhere. I'm 6'6 and can sit in the back seat without knees touching front seats. Also plenty of head room.

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