K.C.
If you can't afford the britax, I would get the Graco Nautilus. We have one in my husband's car and are pretty happy with it. The britax frontier is a little more comfortable and the armrests move up and down, but my son has never complained about the graco and seems happy with it. He is approx 45" and 48 lbs and has plenty of room to grow in the seat.