Thanks guys, that's really helpful.
I've been careful to allow no modded blocks for exactly this reason, so that would hopefully not be a problem.
Yes, my community is very attached to their existing work, so they'll want to at least try to keep the current world
Understood that the new resources would not be on existing generated chunks - to the community, it will be a price worth paying. We'll build a nether railway to a new mining area.
Thanks for confirming it will be 1.7.10 next. I should be safe to upgrade my existing server from 1.7.2 to 1.7.10 to fix a few bugs. :-)
Not familiar with Cauldron - have just had a quick read, but unclear on why I would need it? (edit) Ah, sorry, you meant that if I want to use any bukkit mods, I would need cauldron? Thanks. :-)