Evenflo Big Kid LX Booster Car Seat Advantages: It’s easy to put together and install; Nice padding; Easy to use; The dual cupholder/snack trays have great capacity.

Britax Marathon 70 Car Seat Pros: Solid, intuitive build; Simple and easy to change the height of the straps; Soft and comfortable; Installed easily; Provides an extraordinary level of protection.

Britax Boulevard 70 Car Seat Pros: 70 lbs weight limit; Very sturdy; Very comfortable & safe; The harness is easy to adjust; Installation is a breeze. Cons: Heavy and bulky.

Britax Frontier 85 Pros: Looks nice, The fabric is soft and high quality, Very safe & comfortable, Let’s your child stay longer in a harness, comes with integrated cup holders and arm rests, that kids love.

Britax Roundabout 55 Car Seat Pros: The fabric on the seat is nice and plush, Feels solid and well constructed, The LATCH connectors are super easy and store away neatly if you are using a seat belt.

Recaro Young Sport works as:
1) Harness (20-40lbs up to 40in. tall)
2) Booster (30-80lbs 37-59in. tall)

As the child grows, the Young Sport’s headrest adjusts to five different height positions.[...]

Graco Nautilus 3-in-1 car seat can save you the trouble of changing three different car seats.
It will accompany your child straight from the rear seat to backless booster. [...]