I love
Aurora! It's usually in my top 5, often as #2. I find it a charming, feminine and strong name. I don't think it sounds like a mumble at all. I hope it falls in popularity, I think it'd lose some of its charm if it got as common as
Ava,
Isabelle and
Charlotte.
I like
Lily,
May and
Aurora as sisters a lot, even though
Aurora might stand out as longer and not as simple as the other two, I think they're all very beautiful.