I need a new booster for my 6 yr old. We bought it 4-1/2 yrs ago when we were transporting my neice around and we just eventually put him in it. But I really think he would be better off in a different booster. He's really tall (57") and I'm not sure his torso height but for camparison purposes I put him in DD's nautilus and his shoulders were above the shoulder belt positioner in its highest position by about 1/2 and inch- 1 inch. He's also VERY slender. He is currently in a turbo booster. He does still need a booster and I want to keep him in one. I don't want to spend ALOT of money on a new booster because he is so close to passing the 5 step test (about 1 inch more on the legs and he fits great in our backseat, knees bent over, butt all the way back, sits up straight, everything but the feet flat on the floor, which are about an inch, if that from being flat. Any suggestions for a good booster for him? If we could find one with a back still I'd be thrilled (DH wouldn't but he's left carseat choices to me).