I had an infant "carrier" seat for my older three, but it expired last summer. I initially thought I wouldn't replace it if I had another baby--they use it so briefly that it didn't seem worthwhile--but I think I will. I'm an apprentice midwife, and the baby will come with me to prenatals until he-or-she becomes to troublesome to have along (I planned on taking my now-19-month-old along until she was a year old, but she was walking by 10 months and into EVERYTHING months before that, so I think I started leaving her behind when she was ~10 months or so), and it will be nice to be able to transport a sleeping baby without waking him or her. I'm also planning on taking the baby to one birth in November (a friend and repeat client) and, in the ideal picture in my mind, the baby sleeps right through that birth, in his or her handy infant carrier (and, if it actually works out that way, the infant seat will be worth whatever I pay for it).
If anyone has any infant seat recommendations, I'm interested to hear them. My other one was a Graco Snugride. I go back-and-forth about whether to get one of the higher weight-limit seats, because my kids have all been big (from 9+ to 10-and-a-half lbs at birth) and they outgrew the seat relatively early (I think my youngest, and largest, may have outgrown it at 5-6 months--by height), but my friend has one of the larger seats and it's so heavy and large that I sort of wonder if I'd actually use it that way once the baby is beyond the size-limit of the smaller one, anyway (I think the lower-limit ones are heavy enough to drag around).