I am sorry to say, the DLC is now all included in the season pass. Being picky and choosy is no longer an option. Though, the season pass is often included in a number of special editions. The Center is one of the most visually pleasing maps though this one is available for free. I would argue Aberattion is the best as the map is completely different in its tone thanks to the bulk of its creatures, resources, and progress being set in a vast network of underground caves.