Unfortunately, most kids do outgrow the ComfortSport very early and that's exactly why we don't recommend it at all. It's low back and low top slots make it a bad choice for the money.
Is your daughter still rear-facing? At only 2 years old and 23 lbs., she would be SO much safer rear-facing. The American Academy of Pediatrics recommends rear-facing for as long as possible (to the upper limits of a convertible carseat) for the best protection. My 2.5 year old is 27 lbs. and about 36.5 in. tall and has never been forward-facing in his life. He and his little brother will rear-face to the maximum limits of their seats.
A child's vertabrae do not fully fuse until 3-6 years old, before then, she is at great risk for internal decapitation. The spinal column can stretch up to 2 inches in a crash BUT the spinal cord can only stretch up to 1/4 inch before it snaps and kiddo is gone.
Watch this video...it contains crash test footage of a rear-facing seat vs. a forward-facing seat, you will see the HUGE difference it makes on a child:
http://youtube.com/watch?v=kRP7ynNI8mI
And here's another video about the same thing, but it has a few pictures of my boys in it, along with lots of other rear-facing kiddos:
http://www.youtube.com/watch?v=Y2DVfqFhseo
And here are some great links:
http://www.cpsafety.com/articles/stayrearfacing.aspx
http://www.childrestraintsafety.com/rear.html
http://www.thecarseatlady.com/car_seats/rear-facing_seats_2.html
Your best seat choices:
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Britax Marathon/Decathlon/Boulevard (33 lbs. RF & 65 lbs. FF) $220-$300 - Can be tethered rear-facing (improves stability in side-impacts and rollovers and is especially beneficial for older RF babies/toddlers), have built-in lockoffs, very easy to install and use, tall back, tall top slots, great padding, will last until 2-4 years old rear-facing and about 5 years old forward-facing.
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SunShine Kids Radian (33 lbs. RF & 65 lbs. FF) $180 - Can be tethered rear-facing, tall back, tall top slots, can be difficult to install, good padding, will last until 2-4 years old rear-facing and about 5-6 years old forward-facing.
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Fisher Price Safe Voyage Deluxe (made by Britax, 33 lbs. RF & 55 lbs. FF) $150 - Easy to install and use, tall back, tall top slots, NO rear-facing tether, good padding, will last until 2-4 years old rear-facing and about 5 years old forward-facing.
The
Recaro Como and Signo will be priced the same as the Britax's. They'll go to 35 lbs. RF and 70 lbs. FF. They won't be out until July or later, but they sound like they'll be great seats.
The new
Triumph Advance will go to either 30 or 35 lbs. RF and to 50 lbs. FF. It's supposed to be priced the same as the current one, but it will have a taller shell and top slots. It'll be out in July, if I'm not mistaken.
Oh and by the way, I have a 2002 2-door Cavalier. I have 2 rear-facing Britax Marathons in there, so if you're worried about the size of those, don't be!