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I haven't really thought about it much, but if I had to pick three things off the top of my head...
Ocelots- Take one with me along with a wolf so that Creepers won't attack me and so I have a partner to help me during unwanted fights.
Village Trading (which would also enable Emerald Ore.)- The villagers feel useless and most of mine wander about in the desert now, since I kinda stole all their doors when I first started....anyway, would be nice to be able to get good items from them.
Anvil- I want to be able to rename and repair items.