I don't play many different games; Portal (2) and Skyrim are the only recommendations I have there (or Amnesia if you're at all into horror).
But whatever you end up buying, my advice is to see if you can get it cheaper by doing it in a round about way. One time I wanted to buy another copy of Portal 2 and it was 20 euros, but on Outpost people sold the game for 3 Keys which I could buy for like 6 euros.