[Kurway]

I am playing the closed beta non-stop for like two weeks now.
All the content is not in yet. It's pretty basic atm but damn addictive.
Free to Play with premium plan option: with $100 a year you won't need to spend more.

After release (soon™), they plan to make some kind of world map divided into territories where you can conquer space with your clan/guild.
http://www.worldoftanks.com/