Wow, a really interesting thread and something that we will be considering after we have our next bub. Just a quick comment on the possibility of having TL if and when you are having a CS:

My SIL asked for that (she was having her fourth at the time) and the doctor refused simply because he felt it was too risky doing it when bubs is so young and may not "make it". Apparently they feel more comfortable performing the procedure when your baby is older and out of the SIDs and young high-risk age group. His rationale was that if anything happened to the baby, many couples would want to go back a try for another. SIL still maintained that even if she lost her little girl she would not try for another baby. He still wasn't prepared to budge. Perhaps not of particular help to the OP, but just thought I would add this in as it is somewhat related to the topic and may be worth bearing in mind.