In the ideal world who knows how many i'd have but realisticly once i have this one i really don't see us going back for anymore. DH is one of five and i am one of two, very different family situations but are both quite content with the thought of just two of our own. Right throughout this pregnancy i have said this is it.

Major factors are financial (but i hate that that even comes into it)
I don't want my DH and myself to have to work flat out for years to be able to put them all through, school, highschool, uni, cars, weddings things like that.
I want to be able to work part time while they are babies and go back to full time when they are school age, not before.
I'd love for us to be able to relax a bit at a 'fairly youngish age'.
Our house would not suit anymore than 4 people and i'm really quite content here.
The car is the same situation.

DS was a beautiful baby once we established a routine and knew what we were doing as parents. As much as he is at that challenging stage now he is still really great. I am a bit uncertain about this one but hopefully if i put in the hard yards again with this one it''ll be just as good. I may be in dream land but we'll soon find out.