I want some official stuff and some I don't mind.
From WOTC: - monster manual (90% converting monsters from previous versions), a players book (no new classes just subclasses, feats and spells), a DM book (magic items - not sure what else - maybe advanced encounter guidelines, made for more experienced DM's)
From wotc or from 3rd party: - adventures, maybe the odd bunch of new monsters or magic items, NPC templates,
I prefer the tools of the game (classes, feats, spells) to be official as unofficial stuff has a much higher chance of being unbalanced or whacky - sometimes it's hard to tell until it's unbalancing your game, and I can't be bothered finding out. I have a lesser prejudice against 3p monsters but still a bit of prejudice (because if I put an unbalanced monster in my game it's a one off but a feat or subclass can create much bigger problems).
But when it comes to adventures I find wotc or 3p are as likely as each other to hold gems.