See in the world of 5e as I've experienced it so far (which is not as much as I'd like), if I was to dream up an ideal party there would be 2 sets, one as a player and one as DM.
DM:
4 Player - Barbarian, Life Cleric, Sorcerer, Ranger
6 Player - Barbarian, Life Cleric, Sorcerer, Ranger, Rogue...