How many seats does your car have and do you wish you had more/less?

We're trying to pick out a car for when we move back to the states. I'm pregnant with our first now. We're considering either a 5 or 7 seat SUV.

On one hand I think a 5 seater will be plenty, they are cheaper, easier to drive, better MPG....on the other hand I plan to keep the car for a long time and am wondering if when we have 2-3 kids I may regret not having a bigger car with extra space for road trips, carpools, visitors,...