They all do kind of blend into one as they're very popular at the moment, along with similar names (Lyla, Lila, Lola etc). My personal favourite is Lana as it's a strong name, a bit less cutesy than the others I feel. I wouldn't worry about what it spells backwards. I know a 15 year old Lana and she has never had a problem with this.
Lyra and Lara are equally pretty, but quite popular at the moment. Lena is okay. The only one I truly dislike is Luna.