Whats an ideal age gap between siblings to foster a healthy family atmosphere?

I agree with Jamie. My friend whose two daughters are jut one year apart are very close and could relate well with each other. Myself, I am six year younger than my sister. Though growing up I irritate the hell out of her, we cannot be closer now. Age gap hardly matters. It is the way the children are being brought up. Small or large age gaps have their pros and cons. Make your decision based on when you and your wife feel ready for more and naturally you will be able to make things work. :)