Another thought. We have a 4br / 2 bath home, with one large open plan living/kitchen/dining/lounge space in the middle. The main bedroom is a parents retreat, has a full size en suite and is situated down the other end of the house to the other bedrooms. What we've done is change that room into a sort of study/lounge room (it's a large bedroom) with a fold out lounge/bed for guests. DH and I have our bedroom in the old study which is small but dark and works well, then the other two bedrooms can be used by DD and bub on the way. My point is that as circumstances change and kids get older, you need something with a bit of flexibility. We like that we can move furniture around a bit if we have lots of people coming over, and we can comfortably accommodate at least two families 4 adults + 4 or more kids with a bit of creative thinking about the space. It's a decent sized house under the roofline but not ridiculously massive, probably about 20ish squares? - the key is having flexibility.