Not_the_Point wrote:
Gotcha... so having, say an AMEX that is a credit card as opposed to an AMEX that is a charge card would make no difference in credit type variety?
Nope, that's not it, either. 
All of the above discussion applies only to credit cards. It doesn't matter if your Amex credit card is issued by Amex or by some other bank. It will still be counted as a major bank card on your CRs.
Amex charge cards are a different animal entirely. They are treated as "open" accounts rather than revolving (when they report correctly, anyway).
OK, got it! Thanks and now you see why I have this screen name