I would just register for whatever....I mean there are basic things that you need...carseat, monitors, diaper bags, bath stuff, burp clothes, diapers, stroller, high chair, etc.....and then other things that would be nice to get Bumbo (love mine), wipe warmer, teethers, etc. My advice is just register for whatever you think you would want/need. You are bound to forget something....but you can always edit a registry, it is not set in stone once you create it

Also I am sure you will also be running out to get other things that you realize you need after the baby comes. Don't stress too much