Arcos RPG is a survival RPG server with McMMO, where you can build up your skills while taking on dungeons for set equipment. It mixes PvE and PvP with a more progression based feel, so there is always something to grind, fight, or work toward.
The server also includes kingdoms and nations, along with custom enchantments, custom mobs, custom bosses, and custom items. There are mining areas and drug farming too, so there is both normal progression and a bit of that extra server flavor mixed in.
If you like RPG style servers with economy, factions, and custom content, Arcos RPG is aimed right at that crowd. Developers and helpers are also needed, so if you want to get involved, that side of the community is open too.