So my daughter has actually outgrown her little Graco seat...limit says 22 lbs I believe so we have been looking for a new one. My husband wants to just get one identical to my sons carseat which is the Britax Roundabout. I told him that I think we should upgrade my son to something a little bigger and give Cailyn his old seat. I was thinking about getting the Britax Regent, which would be all he ever needs since it goes to 80 lbs. What do you car seat experts think? Should I just go with another Roundabout and then have to buy yet more seats later when they exceed 40 lbs or just go right to the Regent for my son? ...