I am looking for recommendations for a convertible seat for my son, who is 9 months. He is 28" and weighs 21lbs. We are currently using the Britax Be Safe 35, and are pleased with the quality, but it seems a little narrow and he seems to sweat a good bit when he is in it. I'd like to find a seat that is comfortable for him, and will fit in my vehicle (Jeep Grand Cherokee). This will be the only seat, so a larger width seat is ok. I've looked into the Peg Perego Viaggio and the Evenflo Symphony Elite, but having difficulty deciding on anything. Also important is that the vehicle interior is black, so a carseat with cooling material would be helpful. I'd like to keep the cost under $400 if possible, but any suggestions or recommendations would be greatly appreciated!!