Astana, Give Me an "A!"

I was rather fond of the existing Expo 2017 bid logo, but apparently there are plans to use a different logo for the event itself. They've narrowed down the designs to seven.

My personal favorite is the fifth one, a stylized "A." I think it's unique, addresses the theme in a broad way and feels appropriate for Kazakhstan and Central Asia in general.

The first one, to me, is a little too "on the nose" for an energy theme and seems to limit the theme to a narrower definition of "energy."

The second and fourth ones are pleasant, but I could see both used for lots of uses. They seems very generic. Is it a world's fair? A software company? A shipping company?

The third one is just too obvious and relies too much on an overdone typographic trick.

The sixth one is a bit too simple for my tastes... and also looks very much like Aichi, Japan's Expo 2005 logo.

The seventh one is nice, too, but again, I think it seems to narrow the theme too much a specific definition of "energy." It would make an excellent solar power company logo, however.

You can vote here:
http://www.expo2017astana.com/ru/voting/