Cables are important, but they should not be expensive. To help untangle some of the confusion, here is a simple, somewhat opinionated taxonomy of most of the cables that we deal with in our lives. It’s completely up to date — until the tech industry adds another confusing format to the pile.
Check it out: http://www.nytimes.com/slideshow/2009/04/16/technology/personaltech/20090416-BASICS-SLIDESHOW_index.html?ref=personaltech