My understanding of credit scores is that open available credit helps immensely. If you set up some bills you pay regardless to be paid by this card, you keep it open. I had a 2000 line on a card that I only used in emergencies that was closed due to non use by the creditor. That killed my credit score, and when I got laid off two weeks later, nearly prevented me fom getting another job. Employers do look at credit scores sometimes, and this one did, especially because the job required handling large sums of cash.
My recommendation: have your cell phone, Netflix, Hulu, and any other subscription type services come on that card and then treat the card like a utility payment. Now, take the card out of your wallet and make it inconvienent to get at... Ie put it in your safe deposit box, or (I actually have done this) put the card in a ziplock bag, put that zip bag inside another larger one, add water to the second one, and stick it in the freezer. That way, if there is a true emergency, it is available, but you have to really have a true emergency in order to get at it.
