Hi Mandrake,
Thanks for starting this post!
I'm in the same boat and we've decided it'll be one of the Yunda or Shida primaries (or maybe Hongqi or Changchun primaries) - all top Chinese primary schools and then off to boarding school overseas at 12 if the kids seem the type to handle it. If not, we'll go all the way here.
In regards to these schools, I've tutored/taught ex-students of theirs and they may be 'exam-factories' but their students cream every other student in Yunnan. Shida Fuzhong is ranked the 37th best school in China which is nothing to sneeze at - direct admission to top local and chinese universities is an entirely possible outcome.
However, I think that we're in a different situation to lot of expats as we gave our kids Chinese citizenship and a Kunming hukou anticipating this decision.I understand that if you enter these schools on a foreign passport it's easy BUT the school fees are significant, around 40,000 a year (so I heard). If you're Chinese you either need an apartment in the right place, an exam score or money AND always guanxi to get your kid a place.
As far as I know the private situation for private schools is pretty grim - there's KIA which was originally of American Christian missionary origin though now (according to ex-teachers) sold out to rich chinese. There's also a lunatic Korean christian school up north (by lunatic I mean bible quotes in their math textbooks) which I wouldn't even consider. KIA costs 100,000RMB a year or some crazy thing like that.