Cars for 4 kids (including 3 toddlers!)

[LumpySpaceCow]

Hi!
Currently have a 7 seater but the middle seat on the third row is only a small seat so doesn't fit a car seat.
We are expecting baby number 4 and kids will be 7. 3 and nearly 2 when born.
What cars do other people have and how do they configure seats?
Currently thinking will have to have toddler in front, 2 car seats either side of middle for baby/toddler and then 7 years old in middle and then DH in boot! We are looking into getting another car though if we can find one suitable we can afford!
Thanks!

Thanks everyone.
Lots of food for thought.
I really don't think we will be able to afford a new car at the minute but I'm still confused as what to do and I feel uneasy about using the 3rd row of seats on a regular basis - but then again, on long journeys e.g. holidays, we're not going to have a choice!
Currently thinking, baby in front, kids on 2nd row and then when we are all the car, one of the kids on 3Rd row.

VW maxi life. Its basically a caddy maxi Van but with 7 seats. The seats are all proper seats and even with all 7 in use boot space is big enough for our dogs / shopping etc

Rear seats will fold down or you can remove them entirely to give a huge boot. This is what we do when we go on holiday as can fit bikes etc too.

Price wise much cheaper than the transporter but not as attractive. We bought a relatively new one with the intention of keeping it for probably 10 years. By then we'll get away with a normal car.