Reading all these comments is inching me closer and closer to applying for the Amazon card, but something about applying for a new credit line goes against the grain with me. I already have 3 credit cards, and absolutely no other credit lines open (no auto loans, no mortgages, etc). 1 of my credit cards never gets used, and another one (a Visa) is only used when a merchant won't take my most-used card, an American Express Blue card.
My credit score is always in the 840-850 range, though my credit reports often mention that I don't have enough lines of credit open. I mean - with a score in that range, how much better can it get? Today, I wasn't able to access my Equifax account online. They were unable to verify my identity over the phone as, according to them, I don't have enough credit accounts open for them to perform the verification. As a result, it has to be done via mail. This got me to thinking that maybe I should get another credit card.
As a result, I'm slowly inching towards getting the Amazon Prime card, but it's a big decision for me. I'm very protective of my credit score, though heaven knows why, as I hardly ever need it for anything
Anyway, if I do get the card, thank you to all who have commented here. If I'm going to use CC's for all my regular purchases, I might as well be getting 5% back, which is significantly better than the 1% my Amex points get me.