Capitalization does not matter. All characters will be treated as lowercase. Choosing your company's title is the obvious choice and can be a fine selection. However, consider including keywords that identify your main product or service . This can both help the site's placement within the search engines and also reinforce your offerings to the public.
Catchy ones are great choices.
The chances of people revisiting your site may be enhanced if they can easily remember how to get back. We Accept American Express, MasterCard, Visa, and Business Checks.