We need a pretty good modpack for it. Should we go towards older versions, around 1.7.10 or 1.9/1.10?
If we have the server up and running, lets make it so that anything destructive like nukes are banned by a plugin.
We could do FTB Infinity Evolved if we're more interested in a long-term grindy sort of pack, or maybe Regrowth if we're interested in a cooperative questing pack. There's also a terrafirmacraft modpack on the FTB launcher at the moment (whose name escapes me), and I know a lot of us like that mod.
Also, Crackpack and Inventions are also available for a standard kitchen-sink style of modpack.
Finally, if none of that suits us, I could build a bootleg modpack through a series of polls in another thread and then illicitly distribute it to those of us interested in the server. I wouldn't be able to host in any of these cases.
EDIT:
TerraFirmaPunkThis is the pack that I couldn't remember the name of