Hmmm, it is a tough choice between EToS's A Virgin and A Whore and Chaotic Beauty.
They are both amazing albums, and if you have the cash get both.
But if you can only pick one, it would have to depend on what you want. Chaotic Beauty is a lot heavier, while A Virgin and A Whore is a little slower, but just sounds amazing.
I think I would lean towards Chaotic Beauty.