Splendor is the best. It has that "just one more" quality too. Slam-dunk winner, I say.
Plays best with 3-4 I've found, unless I'm missing something about 2 player. I've only played it 5-6 times, and of course it's really hard to judge a game based on that.
Other than that it's fun!
Also, those chips. Oh those chips. Best component ever!