Just to stay on track with the OP - We are expecting our second soon and I am done. Im sure DH would love to squeeze a 3rd out of me but its not happening. I waited 5 years to feel comfortable being able to handle newborn-hood again, I have realised there is no way I could cope with a toddler and newborn and there is no way Im going through another pregnancy in 5 years time.
2 is our number. I can't think of any 'cons' for stopping at 2 for us.