i will have 4 aged 5 and under so will have 3 car seats and a booster....
....ummm this is me in approx 6 days.....we have 2 x maxi riders, and a SNS convertible and a capsule in our car - its a Chrysler Voyager. Soooo much room for the girls, tinted windows, cd player, i love it......we did have a honda odyssey (most gorgeous car ive ever owned), but when we got a suprise BFP we had to sell. No way we could get 4 x car seats in that thing.
We looked at Kia's too...but DH wasnt too impressed with their track record.

Good luck....it did my head in (looking for a new car !!).