Hi Just. This has been done a lot here... we need more info as BD asks, also age of children, previous schooling, future plans. You can get excellent advice on here.
Also, the Good Schools Guide covers Paris now. I think you can do basic searches for free (but need to subscribe to read the reviews etc). I don't know of any other body that can give you the full overview plus totally objective report on individual schools of interest. But I may be wrong!
Do you want international schools (US curriculum or international curriculum / international baccalaureate) type schools (very expensive unless your company is paying) or do you want French curriculum schools with a bilingual element? Where will you be living / working?