what's your price range? The following are all good choices because they high height and weight limits and will last most children until they're old enough and mature enough to use a belt-positioning booster. In order of price (low to high) they are:
Evenflo Triumph Advance (~$140 and up)
Compass TrueFit (~$179)
Sunshine Kids Radian (~$200 and up)
Britax Marathon/Decathlon/Boulevard (~$250 and up)
this link has brief overviews of the seats -scroll down to the FAQ post :
http://community.babycenter.com/post/a991035/faq_and_car_...
this site has a lot of useful reviews and info, and the forums are a great place to ask questions regarding what seat would be a good fit for your child, vehicle, and budget - many of the regulars are certified Child Passenger Safety Technicians:
http://www.car-seat.org/forumdisplay.php?f=4
Also please bear in mind that although your daughter meets the 1 year and 20 lbs. MINIMUM for forward facing, she can still safely and comfortably rear-face in a convertible seat, and in fact the American Academy of Pediatrics recommends that children remain rear-facing until they reach the maximum height or weight allowed by their convertible seats because it provides SIGNIFICANTLY greater protection to the head, neck, and spine, particularly for babies/toddlers who have such a large proportion of their weight in their heads. http://www.car-safety.org/rearface.html