For me, it's career all the way. I'm not ready to be a parent, and I'm starting to feel nervous about that because I'm already 30 and still not sure if/when I want to have kids.
There is so much pressure about having kids, but I just don't know if it's for me. I still don't feel like I've "lived" and experienced all the things I want to before I'm tied down with kids. I like my independence and being able to do whatever I want whenever I want.
I also believe that people should be financially stable before bringing kids into the world, and I just don't feel like I'm in a place to provide for kids right now. I don't believe in day care or strangers raising my childen (what's the point of having kids if you never see them or raise them yourself), so one of us would have to give up our career...which is impossible to do out in California. We'd have to move to another state in order to be able to live on only one salary, and I'm just not ready to do that right now either.

Of course...the biological clock IS ticking...*sigh*