It should be remembered that all discussions of total delegates counts floating around for the GOP race need to recognize that when it comes to the non-binding caucus states of Iowa, Colorado, Minnesota, Maine, Wyoming, and Washington, with a total of at least 197 delegates, that no one knows yet how the delegates will be allocated.
Ron Paul fans making skylarking guesses based on their assumptions of their success in getting Paulites selected as delegates to county, district, and later state conventions guess that Paul may already have 143 in the bag. Again, no one knows, and if Gingrich and/or Santorum are no longer candidates come convention time (today's results will help shape that), that leaves many more in play.
But delegate estimates floating around are just that, and in most cases their methods of estimation aren't clear. No one knows yet. For what it's worth, the site I've found that seems most in-the-weeds knowledgeable about this stuff is Greenpapers.
For much more about Ron Paul, buy my forthcoming book Ron Paul's Revolution early and often.