Consider how you'll use your web site: Is it a personal or business site? How many visitors do you expect? Do you plan on offering multimedia files? Keep in mind that the more visitors you have, and the more complex your site, the more data transfer you'll use. For example, a web site with a few pages and images will use less data transfer than a large site with downloadable content; similarly, a site that gets only a few visitors won't use as much data transfer as one with heavy site traffic. As your site grows, you may find that your need for data transfer will grow with it.