Moms, what made you sure you wanted another?

I have a 4 year old son and a 20 month old daughter and am on the Mirena. Now I'm really thinking I want one more. Now is the time to decide, I'd like them fairly evenly spaced so I'd like to start trying around January for a fall baby. That gives me a month or so to think things over before getting the IUD removed.

I'd like to hear some of the things you considered in making a choice to have another baby or a choice to have only one or two and stop at that. Your thoughts could really help me make sure I'm making the right choice for me.

If it makes a difference finances aren't an issue, I'm already at home and plan to be until the kids are in school so 2 more years home won't be a big deal. My husband wants whatever I want, after planning on two he sometimes feels like he would like another and sometimes feels two is plenty just like I felt.

Thank you in advance for your thoughts and comments.