SMP mod/plugin suggestions?

I'm looking to create a Vanilla-ish server with the purpose of playing with happy ghasts and Distant Horizons, perhaps some terrain generation mods as well. Any suggestions on the version, things to look out for, mods/plugins to add, etc? I've seen there are mods to add for the happy ghasts to other versions. I'm looking for a Vanilla-ish experience but with some add ons to make the server more interesting and for longevity and performance.
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