friends of ours (4 older kids - blended family) use a Honda Oddesey - they had a Kia and got rid of it because it was too huge.

My MIL, when she was a foster mum, had a starwagon - when that died we bought her a Mitsubishi Delica - yes that is a bus type thing but the height of it etc suited her perfectly & the seats in the back were great when she had 4 booster seats in there.

DH bought me a 63 Chevy Impala for when we have kids (fits 2 kids seats & an adult across the back with room to spare + 3 adults across the front)