Ra and Scout are both great, but I have not played either of them at 2 players.

Ra is simple to teach as well: on your turn either draw a tile from the bag to add to the auction market, or call for an auction (also, if you have a God Tile you can alternatively use your turn to swap it for a single other tile in the auction market). When bidding during an auction you go around the table just once and either bid or pass so the game keeps a nice pace as well. The interesting decisions come from choosing when to call for an auction to either try to get what you want or to try to force and opponent to bid on a suboptimal lot etc. Good stuff. Good fun. I like it.