I love
Nora, but I also love
Imogen. Please do not change the spelling of
Imogen. Imagen looks silly, imo. And is too close to the word "imagine".
Nora has an "a" in it. I like both
Ian and
Noah (though
Ian is a little close in sound to
Liam, that may be a 'yelling across the house' problem :-/).
Good luck!
BTW, all of your kids are gorgeous. :)