I would cross the Eddie Bauer Highback
booster off your list. It does not harness past 40 pounds. I've yet to find a real fan of that seat
The
Graco Nautilus, however, is well loved by the majority of its owners

because it's relatively easy to use (as always: just remember to follow both carseat + vehicle manuals & visit your local CPST for a seatcheck) & also because it keeps kids safer in the harness much longer & becomes quite a user-friendly/comfortable
booster later....