I haven't posted in a long time, and I know this subject has probably been gone over ad nauseum, but I need help finding a new car seat for my DS. We have a Britax Roundabout right now. DS is 2 1/2, 39 inches and 33 lbs. I know we have another inch in height before he outgrows the Roundabout. Looking for a car/booster seat with a harness, not a belt positioning booster. I have a Volvo SUV, so I have some room. When I got the Roundabout I had a smaller car, otherwise I would have gotten one of their bigger seats. I don't really want to spend $250, but I'm open to any suggestions. Any help is greatly appreciated!