Tar, for what it's worth, never being married and/or no kids is a dealbreaker for me. I could never date a guy who didn't understand my life. I'm in a very different life position than you are (I am too old for more children), but it's definitely something you need to think through.
My aunt married a man who already had a child. When she decided she was ready for a child of her own, he said, no, I already have a son, I don't want anymore, sorry. They divorced. That's a tragedy they didn't straighten that out early on.
