Hi Megs
We love our cars and research all to the nth degree when buying one. We actually chose a 07 Nissan Pathfinder Ti (diesel auto). Yes they look like a box, but It is a 7 seater with a massive boot (big enough we had our baby, 3 teenagers, DH & I plus the 3 kids luggage & our reasonably large pram in the boot & it was still comfy), airbags right down all 3 rows & great features. It gets about 12.5L/100kms round town which is not bad for a 2 tonne truck. Tows 3000kgs braked. As for 3rd row anchors, no it doesn't have them, but as someone said previously you can get these fitted & have an engineering certificate put on the car. We didn't choose the Prado because they were just way overpriced for a similarly specced vehichle (don't get me wrong they are brilliant cars, but dollars talk). We also looked at the Pajero's which we didn't choose as the diesel seemed very noisy. We have never had a problem with any of our Nissan's (had 2 Pathies previously and 2 Patrols). We have upgraded our suspension but purely because we want to do more offroading & DH wanted a lift kit too.
Anyway, that's my 2 cents, but from what you've said I actually think out of the ones you mention the Prado will be best & possibly get the best fuel economy too if that was an issue. All this is of course if the child who's to sit in the 3rd row can climb in themselves because none of the 3rd rows are easy to get to in a 4wd. If not, I'd tend to agree with someone else up above & maybe look at a Tarago or Voyager type thing.