Aes Dana is a strange one, When I listen to Aes Dana I don't feel how unique he is but it is hard to think of similar artists. He msut be pretty unique then ay? 
  
Listen to Asura - Code Eternity. Each track is like an Aes Dana album, really ambient parts aswell as upbeat stompy parts. 
  
Also try Distant System - Spiral Empire which you may like too.