I selected all of them. I'm really not bothered what the players play class-wise. It's a free form campaign and I'll never put a whole lot of thought into the cosmology and history in this one.
If I started a world from scratch and wanted any kind of consistency or DM'd a straight FR or Eberron campaign, I would look more closely at what 20 level (beyond the PHB) classes and prestige classes to allow.
Of all the classes in the Complete Divine, I've only played the Ur-Priest. And the only reason I'm playing it is to get a 9th level divine spell and 9th level arcane spell at 20th level:
1 Paladin of Freedom (fallen), 9 Wizard, 2 Ur-Priest, 8 Mystic Theurge. Needed the Able Learner feat to make that work as I prestiged into Ur-Priest earlier than the class list implies, some of the wizard levels are coming at the back end of the progression.
Thanks,
Rich