My DD13 has asked for a nook or kindle for Christmas . I was looking on amazon and noticed they will have the Kindle Touch with special offers and screensavers for $99 (preorder) or $139 w/o. My question is are these screensavers going to be a pain? Is it worth the $40 not to have the special offers and screensavers? Should I preorder or wait to see if there is any deals on black friday on nook or kindle. And is there much of difference between the two? This will be our first ereader purchase, so I know nothing about them. Any suggestions/advice will be greatly appreciated. Thanks!!