Not good at picking favorites, here is a bunch we like a lot but I am probably forgetting some of my favorites:
Midweight euros: Teotihuacan, Beyond the Sun, Lorenzo il Magnifico, Tzol'kin, Marco Polo II, Troyes, Rajas of the Ganges, Lost Ruins of Arnak, Concordia
Tableau/engine builder: Res Arcana, Deus, Race for the Galaxy, Gizmos, Everdell, Wingspan
Deck/bag builder: Ascension, Tyrants of the Underdark, Clank, Dominion, War Chest
Polyomino: A Feast for Odin, Barenpark, Isle of Cats, Patchwork
Roll & write: Hadrian's Wall, Welcome To, Troyes Dice, Ganz Schön Clever
Misc: Kingdom Builder, Babylonia, Space Base, Hive, Santorini, Dice miner, Cascadia, Air Land & Sea