I am posting because I feel like Slimefun would make a fantastic addition to the server for many reasons:

1. It is balanced due to everyone being able to craft the items(unless restricted via permissions, but I'll touch on that later.) but first needing to research them via EXP.
2. It adds 400+ new items into the game, making it pretty hard to get bored on the server.
3. It is easily expandable via addons that are available if you so desire.
4. It is noob friendly. (tutorials available on yt and such.)
5. It has an auto-updater (which can be disabled in the config file if it needs to be)
6.If you think some items give players an unfair advantage, then you can just restrict that item in the permissions, so its also staff (and server) friendly.

Link: https://dev.bukkit.org/projects/slimefun