J.K.
I, too, have a Toyota Corolla. They have the littlest back seats!! My husband refuses to drive my car because he has to put the seat up so much!
Even a Toyota Camry has a roomy back seat. My friend has a Chevy Impala. While I don't see myself driving it, the back seat is HUGE!! I'm interested in looking into VW Passats. I'm a fan of the wagon. My friend has one and says it has a fairly roomy back seat.
Good luck!