Which Resident Evil game to buy?

So I was planning on buying a new Resident Evil game, I have played most of them and know a lot of the story. My choices from games I don't have yet are Code Veronica X, Resident Evil Dead Aim, Resident Evil Outbreak, or Resident Evil Outbreak 2. Which of these should I buy? Story, as well as gameplay info is also appreciated. Thank you! I will choose a best answer