We have 4, and tossing up another one.
Financially at the moment, we are pretty screwed (student and SAHM!) but in 3 years, DH will be finished his degree and start earning some money, and by the time all kids are at school, I'll be finished my uni so both of us will be working and bringing in a good wage.
So if we were going to do it - it would be within the next year to fall pregnant.
Emotionally I'm not sure I want to cope with another baby having reflux because its really really hard, and I find the newborn stage quite difficult - but realistically I know that its not forever, they grow up quickly and then they hit the stage that I find easier to deal with.
Most days are pretty cruisy around here - and thats with a 5 year old, 3 year old, 2 year old and 11 month old. So most people think I'm pretty crazy already so whats one more!
ETA - I'm no spring chicken either (nearly 35) so it would have to be done sooner rather than say, 5 years or so. But we already have the 7 seater car and we rent a 4 bedroom, with two girls sharing a room already, so it would be just squeezing in another one....

