Here's my thoughts on idea groups, btw (in order):
Diplomacy - so good, and you need to spend diplo points for eventual westernization.
Admin - for coring and, even for the Ottomans, mercs. Yes, manpower is a problem even for them, early at least, because you are almost onstantly at war. NOT first - your early conquests for the most part do not need to be self cored.
Expansion - need the capstone for Asia, but a lot of the rest comes in handy also (I am currently 3 over my DR cap for example). And ... you still need to spend diplo points to get far enough behind in tech to westernize. (edit - and, oh yeah, I'll eventually colonize Siberia. Obviously expansion rather than exploration will delay that until the fog of war lifts, but I can't really afford to take both and expansion is really mandatory for expanding into Asia.)
Offensive - could make an argument for defensive or quality, but forced march just SO good.
Religion - seems late, but with piety near 100%, and the bonus for religious unity, you arguably don't need religion at all. But I'll take it to help with unify Islam.
Last 3 don't matter much. Probably will take quality, then ... don't know, seven and eight come so late anyway.