Scythe (first expansion on the way)
Catan (w/ Cities and Knights and Seafarers) - we started with this
Century Spice Road (a little thin for us, but we've only played a handful of games)
Pandemic (great, but we have mastered the base game and are pending an expansion or Legacy)
Then I've got a bunch of stuff to play with family, that doesn't really apply to this thread. Stuff like chess, backgammon, Life, Monopoly, Scrabble, Pit (I do love Pit), Uno, Mexican Train, Cards Against Humanity, etc.
Our group is four strong (two married couples) sometimes with guests. We are very new to the hobby but having a blast so far. I've been doing tons of research and on my list of what to get next I've got the following lined up, in no particular order:
7 Wonders
Blood Rage
Clank
Pandemic Legacy
Arkham Horror LCG (this will be expensive for 4 players so I'm procrastinating)
Dominion
Splendor
Castles of Mad King Ludwig
Agricola
Power Grid
Lords of Vegas