I like the sound of
Arianna better, though I'm quite sick of it lately as we've had about 5 of them born at work so far this year! (Including Aryanna and
Ariana, that is) We've only had one
Natalia, but it sounds a bit harsh to me for some reason.
Natalie, on the other hand, is cute but we've had a big boom of those in my area lately, too. Oy.