I love Project L and the ghost pieces really add a strategic layer to the game while still keeping it simple. My only problem is that i thought i could play with more than 4 players. Be aware that even though you get more player boards and puzzles, you don't get more basic pieces. I you play with more than 4 players, you will run out a pieces way too early and it ruins part of the fun.
I love Concordia. It has a really nice history compnent (it even comes with a pamphlet explaining detailed history of each Roman province featured). The game mechanics work perfectly to create a relatively simple ruleset but an incredibly rich strategy. There are many different ways to play the game, with a lot of micro and macro management. Moreover, you need to be adaptable and skilled at forming plans and thinking ahed to play this game. Truly a very enjoyable game to play. Furthermore, my experience with vaibhavhospital could not be any better. They have the best price for this game I could find, the order came in very quickly in perfect condition, and I love supporting a Canadian company!