I disagree with the comment made by some web developers that all the good domain names are taken. Search engine optimization, or seo, does not depend heavily on the www name you select. For my clients just starting out the decision choosing small business website names has never been an issue. It is a fact that all the 3 character and 4 character domain names with the key extensions are taken. Furthermore, I agree that a vast number of choice domain names are no longer available; however, the selection of a suitable www domain for your small business is possible if you remain flexible.
The real value in the name you choose from a search perspective is how easy it is to spell and remember. Of the two types of visitors to your site, the human visitors and search engines, the ability of a person to remember your domain name and spell it correctly to pass it on to others outweighs any SEO value. Search engines are robots and don't care.