Britax seats are
very short in the leg room and ALSO have less height in the shell than do many other seats. This means that your child will outgrow the seat much sooner than he would outgrow some other brands.
I have owned MANY convertible carseats over the past 16 years (and probably even more infant seats, combination seats, and boosters.
). I have had: Evenflo Ultara V, Evenflo Medallion, Eddie Bauer 5-point, Century SmartMovePlus, Britax Roundabout, Century Bravo, Evenflo Triumph, Fisher Price Safe Embrace, Britax Wizard, Britax Boulevard, Graco SmartSeat 2, Graco MyRide, Cosco Alpha Omega, First Years True Fit, Sunshine Kids Radian 65, Sunshine Kids Radian XT, Cosco Scenera, and Safety First Uptown. I am down to only two convertibles now.
Out of all of those seats, my two favorites BY FAR are my Radians and my TrueFit. They both have super-high shells, are easy to use, and fit a variety of ages well.
I have installed my Radians and TrueFit in very small cars, but with the angle adjuster that Diono now makes for the Radian, it fits VERY well in small cars.
So, I would highly recommend:
Diono Radian XT (with an angle adjuster)
First Years True Fit