I am wondering if anyone can recommend a booster seat. It will be going in the 3rd row of an 05 gmc envoy for a 7 year old boy. He is approx 50lbs and tall, but I dont have a height. I do know he is at the heighest setting of a recaro probooster and outgrown his first years booster. He is currently in a parkway, but the higher I have to adjust it (the kid is growing like a weed!) the more unstable it seems. I really like the way he fits in the nautilus in booster mode, but he doesn't have latch in his spot and I think it is too heavy to use without. One more thing, I do not like flimsy seats. We also have an amp and it seems so flimsy. Anyone have any advice?