Amazon has the Britax Marathon 70 Convertible Car Seat (Red or Pink) for $200 with free shipping. Features integrated steel bars, energy-absorbing tether, side impact protection walls and five-point harness.
A very good feature about this seat is that you can adjust the height of the seatbelt on the fly, no need to remove the seat and rethreads the seatbelts.
And yet -- NO AIRBAG, NO PARACHUTE, NO JET-PROPULSION BREAKING SYSTEM?!??! Nonsense.
A very good feature about this seat is that you can adjust the height of the seatbelt on the fly, no need to remove the seat and rethreads the seatbelts.