i bought the maxi cosi cabrio under the recommendation of the HK COnsumer's council. they were rated the most comfortable & safest. not the most expensive though. they can be fitted in most (i'm not sure whether it's all) maxi cosi strollers. so if u get the maxi cosi cabrio, u can get the quinny. so i put my baby in the cabrio in the car, when we go out to walk around, i just click the car seat onto the frame. when my baby outgrew the infant car seat, i use the frame for the stroller.
maxi-cosi car seats habe been rated safest & most comfortable.