Site: nolo.com
... Use .net, .org, .biz, or .info
If you're like most businesses, you want .com at the end of your domain ... But as you might have surmised by now, many .com names are unavailable. ... However, be careful about using a different suffix with a name that's already a .com name. ... name if your website confuses the .com owner's customers.
2. ... Trouble
The fact that a slightly different name is available, or that a name is not available as .com ...