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Paul SEric, of course the Lemke is just a general operating manual, and hardly the last word. Almost all people here tend to prefer it IF referring to a guide, but use other online resources for accuracy, because the guide can often be way off.
And, although grading has forced some raw sellers to try and be conscientous about their grading, they are naturally subjective - to their benefit, of course 
Get good scans and trust your eyes. And if you haven't read it here already, as almost everyone says about graded cards: "Buy the card, not the holder." (Sorry, don't mean to be elementary in your direction, but I came online here as you do, a pre-graded-era collector after a long layoff -- this is how it was imparted to me, and might save you the time of sifting through posts.)