[scatterbunny]

I don't want to step on any toes here, but you might get more responses at www.car-seat.org

You should be able to fit three across in an Impala, though. Maybe not with a third Britax, but maybe with a Sunshine Kids Radian. It will fit low enough that it should "puzzle" well with the higher Marathons. It has higher top slots than a Marathon so you could use the Radian forward-facing for the oldest, preferably in the center because the FF child is least protected because RF is safest, and use the Marathons RF for the younger two.

You could also look at the new Safety 1st Uptown. It's got EPP foam (like EPS foam), a VERY nice cover, lots of padding and rear-faces to 35 pounds! Top slots are a bit taller than most Dorel-made convertibles, too. Still only a 40 pound harnessed weight limit but by the time baby outgrows this the oldest will be out of her Marathon and it could be passed down to baby as long as it wasn't expired.

	Forward Facing Car Seats A forward-facing car seat is one in which the child sits facing the front of the car. The seat should be installed in the back seat of your vehicle. Most forward-facing only seats are for children above 20 pounds.

	Britax - Click for more info Britax International has been producing reliable child safety products for over 30 years. Not only does Britax have decades of experience creating car seats and other children's safety equipment, Britax has a long standing reputation as an industry leader and innovator. Britax International is headquartered in the United Kingdom, but Britax car seats are designed and manufactured at facilities in Germany, Austria, and the United States. In the summer of 2002, Britax strengthened their commitment to creating the safest car seats with the opening of a brand new, state-of-the-art crash testing facility in North Carolina. Britax car seats have a reputation around the world for being some of the safest, most reliable, and best designed child safety seats ever made.

	Rear Facing Car Seats A rear-facing seat is one in which the infant faces the back of the car. Always install a rear-facing seat in the back seat of your car. This is the safest position for an infant. NEVER place a rear-facing seat in the front seat of a vehicle with passenger airbags.

	Convertible Car Seats Convertible seats are for infants and toddlers. The seat can be used as a rear-facing seats for younger children, and switched to a forward-facing seat on the child's first birthday if the child weighs at least 20 pounds. However, experts recommend keeping the child in a rear-facing position until he or she outgrows the weight or height allowed by the safety seat.

	Britax Marathon - Click for more info Increasing the time a child can safely stay in their convertible car seat is a big issue and Britax engineers have come through in a big way with the introduction of the Britax Marathon with LATCH. A LATCH Compatible Convertible Child Seat, the Britax Marathon can be used rear facing 5 to 33 pounds and forward facing from 20 to 65 pounds. Compare the numbers and you will see it is hard to find a seat with these weight limits that is safe and functional.

	Sunshine Kids - Click for more info Makers of a number of accessories geared towards making parents lives easier, Sunshine Kids has recently embarked in a new direction. In 2005 they unveiled their first car seat, the Radian. Their years of experience working in children's products focusued on child comfort and parent convenience shine through in this unique convertible car seat. The Radian is packed with safety features and is the first ever folding convertible car seat appealing to parents who car pool or travel often.

	Sunshine Kids Radian 80 or 65 - Click for more info If "the Sunshine Kid's Radian 80 convertible car seat is (probably) the only car seat you will ever need," the "probably" part of this statement comes into play when you directly compare the Radian 80 with the Britax Regent. While the Radian 80 has a very high weight capacity, the seat width is only 10" vs. the Regent's 14" seat. The Britax Regent may be a bit wider, but it is very bulky, is only forward facing, and does not fold like the Radian 80. Because the Radian 80 is so narrow, you can potentially put three of them side by side in the back seat. Three Regents side by side? Impossible.