Ethereal is the go to mod for spicing up your game biome game. If you want a mod that makes your world feel like a diverse planet, this is an excellent option. You got lots of variety in biomes, a lot of new items, and it goes very well with the V7 mapgen.
That said, bear in mind the following: You may want to edit which biomes show up in it's mod options menu, some I find tedious and boring. Also, some biomes tend to be far more common than others and if you need resources from certain biomes, you are kinda stuck doing a LOT of exploring to find them. Finally, it does add a lot of ground clutter that may not be for all players who aren't crazy about tons of underbrush.