Well so far I have a world to work with but no story to tell. I'm trying to figure something out right now, but not having any good ideas as to what to do with the party.
As far as books I can say ToB is in for sure, I'm fairly certain I'll let in the binder i'm just not familiar with them so I'd have to actually look at it first. My aim is to have tier 3 power for all the PCs.
If this is the case, would you allow homebrew? I know there are a bunch of tob modified phb classes that were lower than tier 3, like the ranger and paladin, as well as other base classes. Not that we should all be martial adepts, but it might be an interesting few additions.