I think Greyhawk is *dead* as far as being a viable, supported 3e campaign setting (outside of the RPGA's Living Greyhawk projects, unavailable to non-members). The only things we get are Living Greyhawk Journal in Dragon (a few measly pages of varying usefulness) and the occasional mention in other WoTC products. TBH, the specificity (is that a word?) of the GH material in S&F is a detriment to the usefulness of the book, as most gamers are not using the GH setting.
Personally, I always preferred GH to FR, though the WARS thing was where I drew the line and lost nearly all interest in the setting (save for the usefulness of the sourcebooks such as Iuz the Evil and The Marklands). The LGG was well-written and is your best source for 3e GH material, but I am not all that fond of the changes wrought to my favorite setting by 2e/3e. The LGG I have heard is going out of print, so buy it now if you want it!
FR is too high magic (as written) for me, and overly restrictive in what the PCs can do (seeing as how there is a group like the Harpers or Zhentarim to oppose *anything* the PCs might want to do, each with super high level members in abundance!). Uber-munchkin central...