Ok, so I have an almost-15-month old dd who weighs 21 lbs and is about 75% for height and currently rides in a Maxi Cosi Pria 70 as she has since birth. I am really happy with her seat. I chose it before she was born because it A) could hold a newborn, and B) had a high rear-facing capacity. At that time, I was planning on rear-facing her until maybe age 2 or 4 max.
Now, fast forward several months, and the more research I have done, the longer I'd like her to be rear-facing. Age 4 minimum, preferably longer. And I'm expecting another baby in the spring, so I have to buy another car seat anyway. I am leaning toward buying my dd a new seat and passing down the Pria 70 to the new baby. My US options are: another Pria 70, Clek Foonf, or a Radian. I am leaning toward the Foonf, but it does have downsides, particularly the fact that it sits up so high in the car. I have a mini van and it is already hard enough to get her up into her current seat.
So I've looked at importing a Swedish car seat. Something from http://shop.carseat.se/car-seats/, like maybe the Britax Max-Way (but I'm not set on that one). The prices make me cry, but I'm hoping that the grandparents will offer to buy us a car seat as they did with my first. I am aware that it is technically not legal to use a Swedish seat in the US, but I am under the impression that the Swedish seats are much, much safer. Safety concerns me much more.
What I'm wondering, though, is: Will a Swedish car seat give my dd that much more rear-facing time than, say, the Foonf? I am more concerned with maximum height than weight.