I only have two kiddos now but I love our eight seater Sienna. The middle seat in the second row is wide enough for an adult to sit in it comfortably (not a magic seat) and the van has 5 LATCH positions. (three second row two rear) Mines an 09. I think When they changed the body style in '10 or '11 they did away with the "real" 8h seat and went with the skinny worthless seat like the Ody has.
Power sliding doors are a must!