Selecting granite

We are about to select a granite for kitchen countertops.  After reading your website, it seems a lot of "granites" aren't really granite at all.  Assuming we cannot rely on some people to be trustworthy and/or honest, how can we ascertain what stone is REALLY granite?  Is there a website you could recommend?  Three of our current favorites are Lady Dream, Yellow River, and Madura Gold.  Are THEY really granite?  Are any of them more prone to staining?

Thanks,

Debra