G.C.
I have the Graco Nautilus and I LOVE it! It goes up to 52" and 65 lbs with a 5 point harness....the only one I found to go to that extent. Using just a seat belt (with or without the back support,) it takes you up to 100 lbs. It's extremely easy to adjust, which is great with coat/no coat weather. I have heard that some seat belts may not be a match, depending on how high up from the seat the latch itself is. It fits fine for us and is the most solid seat I've seen. It was $150. More than some, less than most.