If you have an SUV, what type of convertible carseat do you have? We are probably getting a car in the next few weeks, and we figured we might as well transition LO to a convertible carseat at the same time, but I keep reading about certain conv. carseats not fitting well in certain cars. SO if you have an SUV, what type of carseat do you have, and does it fit well? Or is this mainly an issue for sedans? We are looking especially at Britax carseats.